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Casino gambling machine

Row of digital-based slot machines inside a casino in Las Vegas

A slot machine, fruit machine (British English), poker ๐ŸŒŸ machine or pokies (Australian English and New Zealand English) is a gambling machine that creates a game of chance for ๐ŸŒŸ its customers. Slot machines are also known pejoratively as one-armed bandits, alluding to the large mechanical levers affixed to the ๐ŸŒŸ sides of early mechanical machines, and to the games' ability to empty players' pockets and wallets as thieves would.[1]

A slot ๐ŸŒŸ machine's standard layout features a screen displaying three or more reels that "spin" when the game is activated. Some modern ๐ŸŒŸ slot machines still include a lever as a skeuomorphic design trait to trigger play. However, the mechanical operations of early ๐ŸŒŸ machines have been superseded by random number generators, and most are now operated using buttons and touchscreens.

Slot machines include one ๐ŸŒŸ or more currency detectors that validate the form of payment, whether coin, banknote, voucher, or token. The machine pays out ๐ŸŒŸ according to the pattern of symbols displayed when the reels stop "spinning". Slot machines are the most popular gambling method ๐ŸŒŸ in casinos and constitute about 70% of the average U.S. casino's income.[2]

Digital technology has resulted in variations in the original ๐ŸŒŸ slot machine concept. As the player is essentially playing a video game, manufacturers can offer more interactive elements, such as ๐ŸŒŸ advanced bonus rounds and more varied video graphics.

Etymology

The "slot machine" term derives from the slots on the machine for inserting ๐ŸŒŸ and retrieving coins.[3] "Fruit machine" comes from the traditional fruit
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on the spinning reels such as lemons and cherries.[4]

History

1899 ๐ŸŒŸ "Liberty Bell" machine, manufactured by Charles Fey

Plaque marking the location of Charles Fey's San Francisco workshop, where he invented the ๐ŸŒŸ three-reel slot machine. The location is a California Historical Landmark.

Sittman and Pitt of Brooklyn, New York, developed a gambling machine ๐ŸŒŸ in 1891 that was a precursor to the modern slot machine. It contained five drums holding a total of 50 ๐ŸŒŸ card faces and was based on poker. The machine proved extremely popular, and soon many bars in the city had ๐ŸŒŸ one or more of them. Players would insert a nickel and pull a lever, which would spin the drums and ๐ŸŒŸ the cards that they held, the player hoping for a good poker hand. There was no direct payout mechanism, so ๐ŸŒŸ a pair of kings might get the player a free beer, whereas a royal flush could pay out cigars or ๐ŸŒŸ drinks; the prizes were wholly dependent upon what the establishment would offer. To improve the odds for the house, two ๐ŸŒŸ cards were typically removed from the deck, the ten of spades and the jack of hearts, doubling the odds against ๐ŸŒŸ winning a royal flush. The drums could also be rearranged to further reduce a player's chance of winning.

Because of the ๐ŸŒŸ vast number of possible wins in the original poker-based game, it proved practically impossible to make a machine capable of ๐ŸŒŸ awarding an automatic payout for all possible winning combinations. At some time between 1887 and 1895,[5] Charles Fey of San ๐ŸŒŸ Francisco, California devised a much simpler automatic mechanism[6] with three spinning reels containing a total of five symbols: horseshoes, diamonds, ๐ŸŒŸ spades, hearts and a Liberty Bell; the bell gave the machine its name. By replacing ten cards with five symbols ๐ŸŒŸ and using three reels instead of five drums, the complexity of reading a win was considerably reduced, allowing Fey to ๐ŸŒŸ design an effective automatic payout mechanism. Three bells in a row produced the biggest payoff, ten nickels (50ยข). Liberty Bell ๐ŸŒŸ was a huge success and spawned a thriving mechanical gaming device industry. After a few years, the devices were banned ๐ŸŒŸ in California, but Fey still could not keep up with the demand for them elsewhere. The Liberty Bell machine was ๐ŸŒŸ so popular that it was copied by many slot machine manufacturers. The first of these, also called the "Liberty Bell", ๐ŸŒŸ was produced by the manufacturer Herbert Mills in 1907. By 1908, "bell" machines had been installed in cigar stores, brothels ๐ŸŒŸ and barber shops.[7] Early machines, including an 1899 Liberty Bell, are now part of the Nevada State Museum's Fey Collection.[8]

The ๐ŸŒŸ first Liberty Bell machines produced by Mills used the same symbols on the reels as did Charles Fey's original. Soon ๐ŸŒŸ afterward, another version was produced with patriotic symbols, such as flags and wreaths, on the wheels. Later, a similar machine ๐ŸŒŸ called the Operator's Bell was produced that included the option of adding a gum-vending attachment. As the gum offered was ๐ŸŒŸ fruit-flavored, fruit symbols were placed on the reels: lemons, cherries, oranges and plums. A bell was retained, and a picture ๐ŸŒŸ of a stick of Bell-Fruit Gum, the origin of the bar symbol, was also present. This set of symbols proved ๐ŸŒŸ highly popular and was used by other companies that began to make their own slot machines: Caille, Watling, Jennings and ๐ŸŒŸ Pace.[9]

A commonly used technique to avoid gambling laws in several states was to award food prizes. For this reason, several ๐ŸŒŸ gumball and other vending machines were regarded with mistrust by the courts. The two Iowa cases of State v. Ellis[10] ๐ŸŒŸ and State v. Striggles[11] are both used in criminal law classes to illustrate the concept of reliance upon authority as ๐ŸŒŸ it relates to the axiomatic ignorantia juris non excusat ("ignorance of the law is no excuse").[12] In these cases, a ๐ŸŒŸ mint vending machine was declared to be a gambling device because the machine would, by internally manufactured chance, occasionally give ๐ŸŒŸ the next user several tokens exchangeable for more candy. Despite the display of the result of the next use on ๐ŸŒŸ the machine, the courts ruled that "[t]he machine appealed to the player's propensity to gamble, and that is [a] vice."[13]

In ๐ŸŒŸ 1963, Bally developed the first fully electromechanical slot machine called Money Honey (although earlier machines such as Bally's High Hand ๐ŸŒŸ draw-poker machine had exhibited the basics of electromechanical construction as early as 1940). Its electromechanical workings made Money Honey the ๐ŸŒŸ first slot machine with a bottomless hopper and automatic payout of up to 500 coins without the help of an ๐ŸŒŸ attendant.[14] The popularity of this machine led to the increasing predominance of electronic games, with the side lever soon becoming ๐ŸŒŸ vestigial.

The first video slot machine was developed in 1976 in Kearny Mesa, California by the Las Vegasโ€“based Fortune Coin Co. ๐ŸŒŸ This machine used a modified 19-inch (48 cm) Sony Trinitron color receiver for the display and logic boards for all ๐ŸŒŸ slot-machine functions. The prototype was mounted in a full-size, show-ready slot-machine cabinet. The first production units went on trial at ๐ŸŒŸ the Las Vegas Hilton Hotel. After some modifications to defeat cheating attempts, the video slot machine was approved by the ๐ŸŒŸ Nevada State Gaming Commission and eventually found popularity on the Las Vegas Strip and in downtown casinos. Fortune Coin Co. ๐ŸŒŸ and its video slot-machine technology were purchased by IGT (International Gaming Technology) in 1978.[citation needed]

The first American video slot machine ๐ŸŒŸ to offer a "second screen" bonus round was Reel โ€™Em In, developed by WMS Industries in 1996.[15] This type of ๐ŸŒŸ machine had appeared in Australia from at least 1994 with the Three Bags Full game.[16] With this type of machine, ๐ŸŒŸ the display changes to provide a different game in which an additional payout may be awarded.

Operation

A person playing a video ๐ŸŒŸ slot machine in Las Vegas

Depending on the machine, the player can insert cash or, in "ticket-in, ticket-out" machines, a paper ๐ŸŒŸ ticket with a barcode, into a designated slot on the machine. The machine is then activated by means of a ๐ŸŒŸ lever or button (either physical or on a touchscreen), which activates reels that spin and stop to rearrange the symbols. ๐ŸŒŸ If a player matches a winning combination of symbols, the player earns credits based on the paytable. Symbols vary depending ๐ŸŒŸ on the theme of the machine. Classic symbols include objects such as fruits, bells, and stylized lucky sevens. Most slot ๐ŸŒŸ games have a theme, such as a specific style, location, or character. Symbols and other bonus features of the game ๐ŸŒŸ are typically aligned with the theme. Some themes are licensed from popular media franchises, including films, television series (including game ๐ŸŒŸ shows such as Wheel of Fortune, which has been one of the most popular lines of slot machines),[17] entertainers, and ๐ŸŒŸ musicians.

Multi-line slot machines have become more popular since the 1990s. These machines have more than one payline, meaning that visible ๐ŸŒŸ symbols that are not aligned on the main horizontal may be considered as winning combinations. Traditional three-reel slot machines commonly ๐ŸŒŸ have one, three, or five paylines while video slot machines may have 9, 15, 25, or as many as 1024 ๐ŸŒŸ different paylines. Most accept variable numbers of credits to play, with 1 to 15 credits per line being typical. The ๐ŸŒŸ higher the amount bet, the higher the payout will be if the player wins.

One of the main differences between video ๐ŸŒŸ slot machines and reel machines is in the way payouts are calculated. With reel machines, the only way to win ๐ŸŒŸ the maximum jackpot is to play the maximum number of coins (usually three, sometimes four or even five coins per ๐ŸŒŸ spin). With video machines, the fixed payout values are multiplied by the number of coins per line that is being ๐ŸŒŸ bet. In other words: on a reel machine, the odds are more favorable if the gambler plays with the maximum ๐ŸŒŸ number of coins available.[18] However, depending on the structure of the game and its bonus features, some video slots may ๐ŸŒŸ still include features that improve chances at payouts by making increased wagers.

A "multi-way" game with several winning lines

"Multi-way" games eschew ๐ŸŒŸ fixed paylines in favor of allowing symbols to pay anywhere, as long as there is at least one in at ๐ŸŒŸ least three consecutive reels from left to right. Multi-way games may be configured to allow players to bet by-reel: for ๐ŸŒŸ example, on a game with a 3x5 pattern (often referred to as a 243-way game), playing one reel allows all ๐ŸŒŸ three symbols in the first reel to potentially pay, but only the center row pays on the remaining reels (often ๐ŸŒŸ designated by darkening the unused portions of the reels). Other multi-way games use a 4x5 or 5x5 pattern, where there ๐ŸŒŸ are up to five symbols in each reel, allowing for up to 1,024 and 3,125 ways to win respectively. The ๐ŸŒŸ Australian manufacturer Aristocrat Leisure brands games featuring this system as "Reel Power", "Xtra Reel Power" and "Super Reel Power" respectively. ๐ŸŒŸ A variation involves patterns where symbols are adjacent to one another. Most of these games have a hexagonal reel formation, ๐ŸŒŸ and much like multi-way games, any patterns not played are darkened out of use.

Denominations can range from 1 cent ("penny ๐ŸŒŸ slots") all the way up toR$100.00 or more per credit. The latter are typically known as "high limit" machines, and ๐ŸŒŸ machines configured to allow for such wagers are often located in dedicated areas (which may have a separate team of ๐ŸŒŸ attendants to cater to the needs of those who play there). The machine automatically calculates the number of credits the ๐ŸŒŸ player receives in exchange for the cash inserted. Newer machines often allow players to choose from a selection of denominations ๐ŸŒŸ on a splash screen or menu.

Terminology

A bonus is a special feature of the particular game theme, which is activated when ๐ŸŒŸ certain symbols appear in a winning combination. Bonuses and the number of bonus features vary depending upon the game. Some ๐ŸŒŸ bonus rounds are a special session of free spins (the number of which is often based on the winning combination ๐ŸŒŸ that triggers the bonus), often with a different or modified set of winning combinations as the main game and/or other ๐ŸŒŸ multipliers or increased frequencies of symbols, or a "hold and re-spin" mechanic in which specific symbols (usually marked with values ๐ŸŒŸ of credits or other prizes) are collected and locked in place over a finite number of spins. In other bonus ๐ŸŒŸ rounds, the player is presented with several items on a screen from which to choose. As the player chooses items, ๐ŸŒŸ a number of credits is revealed and awarded. Some bonuses use a mechanical device, such as a spinning wheel, that ๐ŸŒŸ works in conjunction with the bonus to display the amount won.

A candle is a light on top of the slot ๐ŸŒŸ machine. It flashes to alert the operator that change is needed, hand pay is requested or a potential problem with ๐ŸŒŸ the machine. It can be lit by the player by pressing the "service" or "help" button.

Carousel refers to a grouping ๐ŸŒŸ of slot machines, usually in a circle or oval formation.

A coin hopper is a container where the coins that are ๐ŸŒŸ immediately available for payouts are held. The hopper is a mechanical device that rotates coins into the coin tray when ๐ŸŒŸ a player collects credits/coins (by pressing a "Cash Out" button). When a certain preset coin capacity is reached, a coin ๐ŸŒŸ diverter automatically redirects, or "drops", excess coins into a "drop bucket" or "drop box". (Unused coin hoppers can still be ๐ŸŒŸ found even on games that exclusively employ Ticket-In, Ticket-Out technology, as a vestige.)

The credit meter is a display of the ๐ŸŒŸ amount of money or number of credits on the machine. On mechanical slot machines, this is usually a seven-segment display, ๐ŸŒŸ but video slot machines typically use stylized text that suits the game's theme and user interface.

The drop bucket or drop ๐ŸŒŸ box is a container located in a slot machine's base where excess coins are diverted from the hopper. Typically, a ๐ŸŒŸ drop bucket is used for low-denomination slot machines and a drop box is used for high-denomination slot machines. A drop ๐ŸŒŸ box contains a hinged lid with one or more locks whereas a drop bucket does not contain a lid. The ๐ŸŒŸ contents of drop buckets and drop boxes are collected and counted by the casino on a scheduled basis.

EGM is short ๐ŸŒŸ for "Electronic Gaming Machine".

Free spins are a common form of bonus, where a series of spins are automatically played at ๐ŸŒŸ no charge at the player's current wager. Free spins are usually triggered via a scatter of at least three designated ๐ŸŒŸ symbols (with the number of spins dependent on the number of symbols that land). Some games allow the free spins ๐ŸŒŸ bonus to "retrigger", which adds additional spins on top of those already awarded. There is no theoretical limit to the ๐ŸŒŸ number of free spins obtainable. Some games may have other features that can also trigger over the course of free ๐ŸŒŸ spins.

A hand pay refers to a payout made by an attendant or at an exchange point ("cage"), rather than by ๐ŸŒŸ the slot machine itself. A hand pay occurs when the amount of the payout exceeds the maximum amount that was ๐ŸŒŸ preset by the slot machine's operator. Usually, the maximum amount is set at the level where the operator must begin ๐ŸŒŸ to deduct taxes. A hand pay could also be necessary as a result of a short pay.

Hopper fill slip is ๐ŸŒŸ a document used to record the replenishment of the coin in the coin hopper after it becomes depleted as a ๐ŸŒŸ result of making payouts to players. The slip indicates the amount of coin placed into the hoppers, as well as ๐ŸŒŸ the signatures of the employees involved in the transaction, the slot machine number and the location and the date.

MEAL book ๐ŸŒŸ (Machine entry authorization log) is a log of the employee's entries into the machine.

Low-level or slant-top slot machines include a ๐ŸŒŸ stool so the player may sit down. Stand-up or upright slot machines are played while standing.

Optimal play is a payback ๐ŸŒŸ percentage based on a gambler using the optimal strategy in a skill-based slot machine game.

Payline is a line that crosses ๐ŸŒŸ through one symbol on each reel, along which a winning combination is evaluated. Classic spinning reel machines usually have up ๐ŸŒŸ to nine paylines, while video slot machines may have as many as one hundred. Paylines could be of various shapes ๐ŸŒŸ (horizontal, vertical, oblique, triangular, zigzag, etc.)

Persistent state refers to passive features on some slot machines, some of which able to ๐ŸŒŸ trigger bonus payouts or other special features if certain conditions are met over time by players on that machine.[19]

Roll-up is ๐ŸŒŸ the process of dramatizing a win by playing sounds while the meters count up to the amount that has been ๐ŸŒŸ won.

Short pay refers to a partial payout made by a slot machine, which is less than the amount due to ๐ŸŒŸ the player. This occurs if the coin hopper has been depleted as a result of making earlier payouts to players. ๐ŸŒŸ The remaining amount due to the player is either paid as a hand pay or an attendant will come and ๐ŸŒŸ refill the machine.

A scatter is a pay combination based on occurrences of a designated symbol landing anywhere on the reels, ๐ŸŒŸ rather than falling in sequence on the same payline. A scatter pay usually requires a minimum of three symbols to ๐ŸŒŸ land, and the machine may offer increased prizes or jackpots depending on the number that land. Scatters are frequently used ๐ŸŒŸ to trigger bonus games, such as free spins (with the number of spins multiplying based on the number of scatter ๐ŸŒŸ symbols that land). The scatter symbol usually cannot be matched using wilds, and some games may require the scatter symbols ๐ŸŒŸ to appear on consecutive reels in order to pay. On some multiway games, scatter symbols still pay in unused areas.

Taste ๐ŸŒŸ is a reference to the small amount often paid out to keep a player seated and continuously betting. Only rarely ๐ŸŒŸ will machines fail to pay even the minimum out over the course of several pulls.

Display screen of a slot machine ๐ŸŒŸ in tilt mode

Tilt is a term derived from electromechanical slot machines' "tilt switches", which would make or break a circuit ๐ŸŒŸ when they were tilted or otherwise tampered with that triggered an alarm. While modern machines no longer have tilt switches, ๐ŸŒŸ any kind of technical fault (door switch in the wrong state, reel motor failure, out of paper, etc.) is still ๐ŸŒŸ called a "tilt".

A theoretical hold worksheet is a document provided by the manufacturer for every slot machine that indicates the ๐ŸŒŸ theoretical percentage the machine should hold based on the amount paid in. The worksheet also indicates the reel strip settings, ๐ŸŒŸ number of coins that may be played, the payout schedule, the number of reels and other information descriptive of the ๐ŸŒŸ particular type of slot machine.

Volatility or variance refers to the measure of risk associated with playing a slot machine. A ๐ŸŒŸ low-volatility slot machine has regular but smaller wins, while a high-variance slot machine has fewer but bigger wins.

Weight count is ๐ŸŒŸ an American term referring to the total value of coins or tokens removed from a slot machine's drop bucket or ๐ŸŒŸ drop box for counting by the casino's hard count team through the use of a weigh scale.

Wild symbols substitute for ๐ŸŒŸ most other symbols in the game (similarly to a joker card), usually excluding scatter and jackpot symbols (or offering a ๐ŸŒŸ lower prize on non-natural combinations that include wilds). How jokers behave are dependent on the specific game and whether the ๐ŸŒŸ player is in a bonus or free games mode. Sometimes wild symbols may only appear on certain reels, or have ๐ŸŒŸ a chance to "stack" across the entire reel.

Pay table

Each machine has a table that lists the number of credits the ๐ŸŒŸ player will receive if the symbols listed on the pay table line up on the pay line of the machine. ๐ŸŒŸ Some symbols are wild and can represent many, or all, of the other symbols to complete a winning line. Especially ๐ŸŒŸ on older machines, the pay table is listed on the face of the machine, usually above and below the area ๐ŸŒŸ containing the wheels. On video slot machines, they are usually contained within a help menu, along with information on other ๐ŸŒŸ features.

Technology

Reels

Historically, all slot machines used revolving mechanical reels to display and determine results. Although the original slot machine used five ๐ŸŒŸ reels, simpler, and therefore more reliable, three reel machines quickly became the standard.

A problem with three reel machines is that ๐ŸŒŸ the number of combinations is only cubic โ€“ the original slot machine with three physical reels and 10 symbols on ๐ŸŒŸ each reel had only 103 = 1,000 possible combinations. This limited the manufacturer's ability to offer large jackpots since even ๐ŸŒŸ the rarest event had a likelihood of 0.1%. The maximum theoretical payout, assuming 100% return to player would be 1000 ๐ŸŒŸ times the bet, but that would leave no room for other pays, making the machine very high risk, and also ๐ŸŒŸ quite boring.

Although the number of symbols eventually increased to about 22, allowing 10,648 combinations,[20] this still limited jackpot sizes as ๐ŸŒŸ well as the number of possible outcomes.

In the 1980s, however, slot machine manufacturers incorporated electronics into their products and programmed ๐ŸŒŸ them to weight particular symbols. Thus the odds of losing symbols appearing on the payline became disproportionate to their actual ๐ŸŒŸ frequency on the physical reel. A symbol would only appear once on the reel displayed to the player, but could, ๐ŸŒŸ in fact, occupy several stops on the multiple reel.

In 1984, Inge Telnaes received a patent for a device titled, "Electronic ๐ŸŒŸ Gaming Device Utilizing a Random Number Generator for Selecting the Reel Stop Positions" (US Patent 4448419),[21] which states: "It is ๐ŸŒŸ important to make a machine that is perceived to present greater chances of payoff than it actually has within the ๐ŸŒŸ legal limitations that games of chance must operate."[22] The patent was later bought by International Game Technology and has since ๐ŸŒŸ expired.

A virtual reel that has 256 virtual stops per reel would allow up to 2563 = 16,777,216 final positions. The ๐ŸŒŸ manufacturer could choose to offer aR$1 million jackpot on aR$1 bet, confident that it will only happen, over the long ๐ŸŒŸ term, once every 16.8 million plays.

Computerization

With microprocessors now ubiquitous, the computers inside modern slot machines allow manufacturers to assign a ๐ŸŒŸ different probability to every symbol on every reel. To the player, it might appear that a winning symbol was "so ๐ŸŒŸ close", whereas in fact the probability is much lower.

In the 1980s in the U.K., machines embodying microprocessors became common. These ๐ŸŒŸ used a number of features to ensure the payout was controlled within the limits of the gambling legislation. As a ๐ŸŒŸ coin was inserted into the machine, it could go either directly into the cashbox for the benefit of the owner ๐ŸŒŸ or into a channel that formed the payout reservoir, with the microprocessor monitoring the number of coins in this channel. ๐ŸŒŸ The drums themselves were driven by stepper motors, controlled by the processor and with proximity sensors monitoring the position of ๐ŸŒŸ the drums. A "look-up table" within the software allows the processor to know what symbols were being displayed on the ๐ŸŒŸ drums to the gambler. This allowed the system to control the level of payout by stopping the drums at positions ๐ŸŒŸ it had determined. If the payout channel had filled up, the payout became more generous; if nearly empty, the payout ๐ŸŒŸ became less so (thus giving good control of the odds).

Video slot machines

Video slot machines do not use mechanical reels, but ๐ŸŒŸ use graphical reels on a computerized display. As there are no mechanical constraints on the design of video slot machines, ๐ŸŒŸ games often use at least five reels, and may also use non-standard layouts. This greatly expands the number of possibilities: ๐ŸŒŸ a machine can have 50 or more symbols on a reel, giving odds as high as 300 million to 1 ๐ŸŒŸ against โ€“ enough for even the largest jackpot. As there are so many combinations possible with five reels, manufacturers do ๐ŸŒŸ not need to weight the payout symbols (although some may still do so). Instead, higher paying symbols will typically appear ๐ŸŒŸ only once or twice on each reel, while more common symbols earning a more frequent payout will appear many times. ๐ŸŒŸ Video slot machines usually make more extensive use of multimedia, and can feature more elaborate minigames as bonuses. Modern cabinets ๐ŸŒŸ typically use flat-panel displays, but cabinets using larger curved screens (which can provide a more immersive experience for the player) ๐ŸŒŸ are not uncommon.[23]

Video slot machines typically encourage the player to play multiple "lines": rather than simply taking the middle of ๐ŸŒŸ the three symbols displayed on each reel, a line could go from top left to the bottom right or any ๐ŸŒŸ other pattern specified by the manufacturer. As each symbol is equally likely, there is no difficulty for the manufacturer in ๐ŸŒŸ allowing the player to take as many of the possible lines on offer as desired โ€“ the long-term return to ๐ŸŒŸ the player will be the same. The difference for the player is that the more lines they play, the more ๐ŸŒŸ likely they are to get paid on a given spin (because they are betting more).

To avoid seeming as if the ๐ŸŒŸ player's money is simply ebbing away (whereas a payout of 100 credits on a single-line machine would be 100 bets ๐ŸŒŸ and the player would feel they had made a substantial win, on a 20-line machine, it would only be five ๐ŸŒŸ bets and not seem as significant), manufacturers commonly offer bonus games, which can return many times their bet. The player ๐ŸŒŸ is encouraged to keep playing to reach the bonus: even if they are losing, the bonus game could allow them ๐ŸŒŸ to win back their losses.

Payout percentage

Slot machines are typically programmed to pay out as winnings 0% to 99% of the ๐ŸŒŸ money that is wagered by players. This is known as the "theoretical payout percentage" or RTP, "return to player". The ๐ŸŒŸ minimum theoretical payout percentage varies among jurisdictions and is typically established by law or regulation. For example, the minimum payout ๐ŸŒŸ in Nevada is 75%, in New Jersey 83%, and in Mississippi 80%. The winning patterns on slot machines โ€“ the ๐ŸŒŸ amounts they pay and the frequencies of those payouts โ€“ are carefully selected to yield a certain fraction of the ๐ŸŒŸ money paid to the "house" (the operator of the slot machine) while returning the rest to the players during play. ๐ŸŒŸ Suppose that a certain slot machine costsR$1 per spin and has a return to player (RTP) of 95%. It can ๐ŸŒŸ be calculated that, over a sufficiently long period such as 1,000,000 spins, the machine will return an average ofR$950,000 to ๐ŸŒŸ its players, who have insertedR$1,000,000 during that time. In this (simplified) example, the slot machine is said to pay out ๐ŸŒŸ 95%. The operator keeps the remainingR$50,000. Within some EGM development organizations this concept is referred to simply as "par". "Par" ๐ŸŒŸ also manifests itself to gamblers as promotional techniques: "Our 'Loose Slots' have a 93% payback! Play now!"[citation needed]

A slot machine's ๐ŸŒŸ theoretical payout percentage is set at the factory when the software is written. Changing the payout percentage after a slot ๐ŸŒŸ machine has been placed on the gaming floor requires a physical swap of the software or firmware, which is usually ๐ŸŒŸ stored on an EPROM but may be loaded onto non-volatile random access memory (NVRAM) or even stored on CD-ROM or ๐ŸŒŸ DVD, depending on the capabilities of the machine and the applicable regulations. Based on current technology, this is a time-consuming ๐ŸŒŸ process and as such is done infrequently.[citation needed] In certain jurisdictions, such as New Jersey, the EPROM has a tamper-evident ๐ŸŒŸ seal and can only be changed in the presence of Gaming Control Board officials. Other jurisdictions, including Nevada, randomly audit ๐ŸŒŸ slot machines to ensure that they contain only approved software.

Historically, many casinos, both online and offline, have been unwilling to ๐ŸŒŸ publish individual game RTP figures, making it impossible for the player to know whether they are playing a "loose" or ๐ŸŒŸ a "tight" game. Since the turn of the century, some information regarding these figures has started to come into the ๐ŸŒŸ public domain either through various casinos releasing themโ€”primarily this applies to online casinosโ€”or through studies by independent gambling authorities.[citation needed]

The ๐ŸŒŸ return to player is not the only statistic that is of interest. The probabilities of every payout on the pay ๐ŸŒŸ table is also critical. For example, consider a hypothetical slot machine with a dozen different values on the pay table. ๐ŸŒŸ However, the probabilities of getting all the payouts are zero except the largest one. If the payout is 4,000 times ๐ŸŒŸ the input amount, and it happens every 4,000 times on average, the return to player is exactly 100%, but the ๐ŸŒŸ game would be dull to play. Also, most people would not win anything, and having entries on the paytable that ๐ŸŒŸ have a return of zero would be deceptive. As these individual probabilities are closely guarded secrets, it is possible that ๐ŸŒŸ the advertised machines with high return to player simply increase the probabilities of these jackpots. The casino could legally place ๐ŸŒŸ machines of a similar style payout and advertise that some machines have 100% return to player. The added advantage is ๐ŸŒŸ that these large jackpots increase the excitement of the other players.

The table of probabilities for a specific machine is called ๐ŸŒŸ the Probability and Accounting Report or PAR sheet, also PARS commonly understood as Paytable and Reel Strips. Mathematician Michael Shackleford ๐ŸŒŸ revealed the PARS for one commercial slot machine, an original International Gaming Technology Red White and Blue machine. This game, ๐ŸŒŸ in its original form, is obsolete, so these specific probabilities do not apply. He only published the odds after a ๐ŸŒŸ fan of his sent him some information provided on a slot machine that was posted on a machine in the ๐ŸŒŸ Netherlands. The psychology of the machine design is quickly revealed. There are 13 possible payouts ranging from 1:1 to 2,400:1. ๐ŸŒŸ The 1:1 payout comes every 8 plays. The 5:1 payout comes every 33 plays, whereas the 2:1 payout comes every ๐ŸŒŸ 600 plays. Most players assume the likelihood increases proportionate to the payout. The one mid-size payout that is designed to ๐ŸŒŸ give the player a thrill is the 80:1 payout. It is programmed to occur an average of once every 219 ๐ŸŒŸ plays. The 80:1 payout is high enough to create excitement, but not high enough that it makes it likely that ๐ŸŒŸ the player will take their winnings and abandon the game. More than likely the player began the game with at ๐ŸŒŸ least 80 times his bet (for instance there are 80 quarters inR$20). In contrast the 150:1 payout occurs only on ๐ŸŒŸ average of once every 6,241 plays. The highest payout of 2,400:1 occurs only on average of once every 643 = ๐ŸŒŸ 262,144 plays since the machine has 64 virtual stops. The player who continues to feed the machine is likely to ๐ŸŒŸ have several mid-size payouts, but unlikely to have a large payout. He quits after he is bored or has exhausted ๐ŸŒŸ his bankroll.[citation needed]

Despite their confidentiality, occasionally a PAR sheet is posted on a website. They have limited value to the ๐ŸŒŸ player, because usually a machine will have 8 to 12 different possible programs with varying payouts. In addition, slight variations ๐ŸŒŸ of each machine (e.g., with double jackpots or five times play) are always being developed. The casino operator can choose ๐ŸŒŸ which EPROM chip to install in any particular machine to select the payout desired. The result is that there is ๐ŸŒŸ not really such a thing as a high payback type of machine, since every machine potentially has multiple settings. From ๐ŸŒŸ October 2001 to February 2002, columnist Michael Shackleford obtained PAR sheets for five different nickel machines; four IGT games Austin ๐ŸŒŸ Powers, Fortune Cookie, Leopard Spots and Wheel of Fortune and one game manufactured by WMS; Reel 'em In. Without revealing ๐ŸŒŸ the proprietary information, he developed a program that would allow him to determine with usually less than a dozen plays ๐ŸŒŸ on each machine which EPROM chip was installed. Then he did a survey of over 400 machines in 70 different ๐ŸŒŸ casinos in Las Vegas. He averaged the data, and assigned an average payback percentage to the machines in each casino. ๐ŸŒŸ The resultant list was widely publicized for marketing purposes (especially by the Palms casino which had the top ranking).[citation needed]

One ๐ŸŒŸ reason that the slot machine is so profitable to a casino is that the player must play the high house ๐ŸŒŸ edge and high payout wagers along with the low house edge and low payout wagers. In a more traditional wagering ๐ŸŒŸ game like craps, the player knows that certain wagers have almost a 50/50 chance of winning or losing, but they ๐ŸŒŸ only pay a limited multiple of the original bet (usually no higher than three times). Other bets have a higher ๐ŸŒŸ house edge, but the player is rewarded with a bigger win (up to thirty times in craps). The player can ๐ŸŒŸ choose what kind of wager he wants to make. A slot machine does not afford such an opportunity. Theoretically, the ๐ŸŒŸ operator could make these probabilities available, or allow the player to choose which one so that the player is free ๐ŸŒŸ to make a choice. However, no operator has ever enacted this strategy. Different machines have different maximum payouts, but without ๐ŸŒŸ knowing the odds of getting the jackpot, there is no rational way to differentiate.

In many markets where central monitoring and ๐ŸŒŸ control systems are used to link machines for auditing and security purposes, usually in wide area networks of multiple venues ๐ŸŒŸ and thousands of machines, player return must usually be changed from a central computer rather than at each machine. A ๐ŸŒŸ range of percentages is set in the game software and selected remotely.

In 2006, the Nevada Gaming Commission began working with ๐ŸŒŸ Las Vegas casinos on technology that would allow the casino's management to change the game, the odds, and the payouts ๐ŸŒŸ remotely. The change cannot be done instantaneously, but only after the selected machine has been idle for at least four ๐ŸŒŸ minutes. After the change is made, the machine must be locked to new players for four minutes and display an ๐ŸŒŸ on-screen message informing potential players that a change is being made.[24]

Linked machines

Some varieties of slot machines can be linked together ๐ŸŒŸ in a setup sometimes known as a "community" game. The most basic form of this setup involves progressive jackpots that ๐ŸŒŸ are shared between the bank of machines, but may include multiplayer bonuses and other features.[25]

In some cases multiple machines are ๐ŸŒŸ linked across multiple casinos. In these cases, the machines may be owned by the manufacturer, who is responsible for paying ๐ŸŒŸ the jackpot. The casinos lease the machines rather than owning them outright. Casinos in New Jersey, Nevada, Louisiana, Arkansas, and ๐ŸŒŸ South Dakota now offer multi-state progressive jackpots, which now offer bigger jackpot pools.[26][27]

Fraud

Mechanical slot machines and their coin acceptors were ๐ŸŒŸ sometimes susceptible to cheating devices and other scams. One historical example involved spinning a coin with a short length of ๐ŸŒŸ plastic wire. The weight and size of the coin would be accepted by the machine and credits would be granted. ๐ŸŒŸ However, the spin created by the plastic wire would cause the coin to exit through the reject chute into the ๐ŸŒŸ payout tray. This particular scam has become obsolete due to improvements in newer slot machines. Another obsolete method of defeating ๐ŸŒŸ slot machines was to use a light source to confuse the optical sensor used to count coins during payout.[28]

Modern slot ๐ŸŒŸ machines are controlled by EPROM computer chips and, in large casinos, coin acceptors have become obsolete in favor of bill ๐ŸŒŸ acceptors. These machines and their bill acceptors are designed with advanced anti-cheating and anti-counterfeiting measures and are difficult to defraud. ๐ŸŒŸ Early computerized slot machines were sometimes defrauded through the use of cheating devices, such as the "slider", "monkey paw", "lightwand" ๐ŸŒŸ and "the tongue". Many of these old cheating devices were made by the late Tommy Glenn Carmichael, a slot machine ๐ŸŒŸ fraudster who reportedly stole overR$5 million.[29] In the modern day, computerized slot machines are fully deterministic and thus outcomes can ๐ŸŒŸ be sometimes successfully predicted.[30]

Skill stops

Skill stop buttons predated the Bally electromechanical slot machines of the 1960s and 1970s. They appeared ๐ŸŒŸ on mechanical slot machines manufactured by Mills Novelty Co. as early as the mid 1920s. These machines had modified reel-stop ๐ŸŒŸ arms, which allowed them to be released from the timing bar, earlier than in a normal play, simply by pressing ๐ŸŒŸ the buttons on the front of the machine, located between each reel.

"Skill stop" buttons were added to some slot machines ๐ŸŒŸ by Zacharias Anthony in the early 1970s. These enabled the player to stop each reel, allowing a degree of "skill" ๐ŸŒŸ so as to satisfy the New Jersey gaming laws of the day which required that players were able to control ๐ŸŒŸ the game in some way. The original conversion was applied to approximately 50 late-model Bally slot machines. Because the typical ๐ŸŒŸ machine stopped the reels automatically in less than 10 seconds, weights were added to the mechanical timers to prolong the ๐ŸŒŸ automatic stopping of the reels. By the time the New Jersey Alcoholic Beverages Commission (ABC) had approved the conversion for ๐ŸŒŸ use in New Jersey arcades, the word was out and every other distributor began adding skill stops. The machines were ๐ŸŒŸ a huge hit on the Jersey Shore and the remaining unconverted Bally machines were destroyed as they had become instantly ๐ŸŒŸ obsolete.[citation needed]

Legislation

United States

In the United States, the public and private availability of slot machines is highly regulated by state governments. ๐ŸŒŸ Many states have established gaming control boards to regulate the possession and use of slot machines and other form of ๐ŸŒŸ gaming.

Nevada is the only state that has no significant restrictions against slot machines both for public and private use. In ๐ŸŒŸ New Jersey, slot machines are only allowed in hotel casinos operated in Atlantic City. Several states (Indiana, Louisiana and Missouri) ๐ŸŒŸ allow slot machines (as well as any casino-style gambling) only on licensed riverboats or permanently anchored barges. Since Hurricane Katrina, ๐ŸŒŸ Mississippi has removed the requirement that casinos on the Gulf Coast operate on barges and now allows them on land ๐ŸŒŸ along the shoreline. Delaware allows slot machines at three horse tracks; they are regulated by the state lottery commission. In ๐ŸŒŸ Wisconsin, bars and taverns are allowed to have up to five machines. These machines usually allow a player to either ๐ŸŒŸ take a payout, or gamble it on a double-or-nothing "side game".

The territory of Puerto Rico places significant restrictions on slot ๐ŸŒŸ machine ownership, but the law is widely flouted and slot machines are common in bars and coffeeshops.[31]

In regards to tribal ๐ŸŒŸ casinos located on Native American reservations, slot machines played against the house and operating independently from a centralized computer system ๐ŸŒŸ are classified as "Class III" gaming by the Indian Gaming Regulatory Act (IGRA), and sometimes promoted as "Vegas-style" slot machines.[32] ๐ŸŒŸ In order to offer Class III gaming, tribes must enter into a compact (agreement) with the state that is approved ๐ŸŒŸ by the Department of the Interior, which may contain restrictions on the types and quantity of such games. As a ๐ŸŒŸ workaround, some casinos may operate slot machines as "Class II" gamesโ€”a category that includes games where players play exclusively against ๐ŸŒŸ at least one other opponent and not the house, such as bingo or any related games (such as pull-tabs). In ๐ŸŒŸ these cases, the reels are an entertainment display with a pre-determined outcome based on a centralized game played against other ๐ŸŒŸ players. Under the IGRA, Class II games are regulated by individual tribes and the National Indian Gaming Commission, and do ๐ŸŒŸ not require any additional approval if the state already permits tribal gaming.[33][34]

Some historical race wagering terminals operate in a similar ๐ŸŒŸ manner, with the machines using slots as an entertainment display for outcomes paid using the parimutuel betting system, based on ๐ŸŒŸ results of randomly-selected, previously-held horse races (with the player able to view selected details about the race and adjust their ๐ŸŒŸ picks before playing the credit, or otherwise use an auto-bet system).[35]

Private ownership

Alaska, Arizona, Arkansas, Kentucky, Maine, Minnesota, Nevada, Ohio, Rhode ๐ŸŒŸ Island, Texas, Utah, Virginia, and West Virginia place no restrictions on private ownership of slot machines. Conversely, in Connecticut, Hawaii, ๐ŸŒŸ Nebraska, South Carolina, and Tennessee, private ownership of any slot machine is completely prohibited. The remaining states allow slot machines ๐ŸŒŸ of a certain age (typically 25โ€“30 years) or slot machines manufactured before a specific date.

Canada

The Government of Canada has minimal ๐ŸŒŸ involvement in gambling beyond the Canadian Criminal Code. In essence, the term "lottery scheme" used in the code means slot ๐ŸŒŸ machines, bingo and table games normally associated with a casino. These fall under the jurisdiction of the province or territory ๐ŸŒŸ without reference to the federal government; in practice, all Canadian provinces operate gaming boards that oversee lotteries, casinos and video ๐ŸŒŸ lottery terminals under their jurisdiction.

OLG piloted a classification system for slot machines at the Grand River Raceway developed by University ๐ŸŒŸ of Waterloo professor Kevin Harrigan, as part of its PlaySmart initiative for responsible gambling. Inspired by nutrition labels on foods, ๐ŸŒŸ they displayed metrics such as volatility and frequency of payouts.[36] OLG has also deployed electronic gaming machines with pre-determined outcomes ๐ŸŒŸ based on a bingo or pull-tab game, initially branded as "TapTix", which visually resemble slot machines.[37]

In Ontario, 4 April 2024 ๐ŸŒŸ saw the re-introduction of the online gambling market. This became possible when the Canadian Criminal Code was amended to allow ๐ŸŒŸ single-event wagering August 2024. The province is expected to generate aboutR$800 million in gross revenue per year.[38]

Australia

In Australia "Poker Machines" ๐ŸŒŸ or "pokies"[39] are officially termed "gaming machines". In Australia, gaming machines are a matter for state governments, so laws vary ๐ŸŒŸ between states. Gaming machines are found in casinos (approximately one in each major city), pubs and clubs in some states ๐ŸŒŸ (usually sports, social, or RSL clubs). The first Australian state to legalize this style of gambling was New South Wales, ๐ŸŒŸ when in 1956 they were made legal in all registered clubs in the state. There are suggestions that the proliferation ๐ŸŒŸ of poker machines has led to increased levels of problem gambling; however, the precise nature of this link is still ๐ŸŒŸ open to research.[40]

In 1999 the Australian Productivity Commission reported that nearly half Australia's gaming machines were in New South Wales. ๐ŸŒŸ At the time, 21% of all the gambling machines in the world were operating in Australia and, on a per ๐ŸŒŸ capita basis, Australia had roughly five times as many gaming machines as the United States. Australia ranks 8th in total ๐ŸŒŸ number of gaming machines after Japan, U.S.A., Italy, U.K., Spain and Germany. This primarily is because gaming machines have been ๐ŸŒŸ legal in the state of New South Wales since 1956; over time, the number of machines has grown to 97,103 ๐ŸŒŸ (at December 2010, including the Australian Capital Territory). By way of comparison, the U.S. State of Nevada, which legalised gaming ๐ŸŒŸ including slots several decades before N.S.W., had 190,135 slots operating.[41]

Revenue from gaming machines in pubs and clubs accounts for more ๐ŸŒŸ than half of theR$4 billion in gambling revenue collected by state governments in fiscal year 2002โ€“03.[42]

In Queensland, gaming machines in ๐ŸŒŸ pubs and clubs must provide a return rate of 85%, while machines located in casinos must provide a return rate ๐ŸŒŸ of 90%.[citation needed] Most other states have similar provisions. In Victoria, gaming machines must provide a minimum return rate of ๐ŸŒŸ 87% (including jackpot contribution), including machines in Crown Casino. As of December 1, 2007, Victoria banned gaming machines that acceptedR$100 ๐ŸŒŸ notes; all gaming machines made since 2003 comply with this rule. This new law also banned machines with an automatic ๐ŸŒŸ play option. One exception exists in Crown Casino for any player with a VIP loyalty card: they can still insertR$100 ๐ŸŒŸ notes and use an autoplay feature (whereby the machine will automatically play until credit is exhausted or the player intervenes). ๐ŸŒŸ All gaming machines in Victoria have an information screen accessible to the user by pressing the "i key" button, showing ๐ŸŒŸ the game rules, paytable, return to player percentage, and the top and bottom five combinations with their odds. These combinations ๐ŸŒŸ are stated to be played on a minimum bet (usually 1 credit per line, with 1 line or reel played, ๐ŸŒŸ although some newer machines do not have an option to play 1 line; some machines may only allow maximum lines ๐ŸŒŸ to be played), excluding feature wins.

Western Australia has the most restrictive regulations on electronic gaming machines in general, with the ๐ŸŒŸ Crown Perth casino resort being the only venue allowed to operate them,[43] and banning slot machines with spinning reels entirely. ๐ŸŒŸ This policy had an extensive political history, reaffirmed by the 1974 Royal Commission into Gambling:[44]

Poker machine playing is a mindless, ๐ŸŒŸ repetitive and insidious form of gambling which has many undesirable features. It requires no thought, no skill or social contact. ๐ŸŒŸ The odds are never about winning. Watching people playing the machines over long periods of time, the impressionistic evidence at ๐ŸŒŸ least is that they are addictive to many people. Historically poker machines have been banned from Western Australia and we ๐ŸŒŸ consider that, in the public interest, they should stay banned.

While Western Australian gaming machines are similar to the other states', ๐ŸŒŸ they do not have spinning reels. Therefore, different animations are used in place of the spinning reels in order to ๐ŸŒŸ display each game result.

Nick Xenophon was elected on an independent No Pokies ticket in the South Australian Legislative Council at ๐ŸŒŸ the 1997 South Australian state election on 2.9 percent, re-elected at the 2006 election on 20.5 percent, and elected to ๐ŸŒŸ the Australian Senate at the 2007 federal election on 14.8 percent. Independent candidate Andrew Wilkie, an anti-pokies campaigner, was elected ๐ŸŒŸ to the Australian House of Representatives seat of Denison at the 2010 federal election. Wilkie was one of four crossbenchers ๐ŸŒŸ who supported the Gillard Labor government following the hung parliament result. Wilkie immediately began forging ties with Xenophon as soon ๐ŸŒŸ as it was apparent that he was elected. In exchange for Wilkie's support, the Labor government are attempting to implement ๐ŸŒŸ precommitment technology for high-bet/high-intensity poker machines, against opposition from the Tony Abbott Coalition and Clubs Australia.

During the COVID-19 pandemic of ๐ŸŒŸ 2024, every establishment in the country that facilitated poker machines was shut down, in an attempt to curb the spread ๐ŸŒŸ of the virus, bringing Australia's usage of poker machines effectively to zero.[45]

Russia

In Russia, "slot clubs" appeared quite late, only in ๐ŸŒŸ 1992. Before 1992, slot machines were only in casinos and small shops, but later slot clubs began appearing all over ๐ŸŒŸ the country. The most popular and numerous were "Vulcan 777" and "Taj Mahal". Since 2009, when gambling establishments were banned, ๐ŸŒŸ almost all slot clubs disappeared and are found only in a specially authorized gambling zones.

United Kingdom

Row of old fruit machines ๐ŸŒŸ in Teignmouth Pier, Devon

One armed bandits at Wookey Hole Caves

Slot machines are covered by the Gambling Act 2005, which superseded ๐ŸŒŸ the Gaming Act 1968.[46]

Slot machines in the U.K. are categorised by definitions produced by the Gambling Commission as part of ๐ŸŒŸ the Gambling Act of 2005.

Machine category Maximum stake (from January 2014) Maximum prize (from January 2014) A Unlimited Unlimited B1 ๐ŸŒŸ ยฃ5 ยฃ10,000 or if the game has a progressive jackpot that can be ยฃ20,000 B2 ยฃ100 (in multiples of ยฃ10) ๐ŸŒŸ ยฃ500 B3 ยฃ2 ยฃ500 B3A ยฃ1 ยฃ500 B4 ยฃ2 ยฃ400 C ยฃ1 ยฃ100 or ยฃ200 If jackpot is repeated D ๐ŸŒŸ (various) 10p to ยฃ8 ยฃ8 cash or ยฃ50 non-cash

Casinos built under the provisions of the 1968 Act are allowed to ๐ŸŒŸ house either up to twenty machines of categories Bโ€“D or any number of Cโ€“D machines. As defined by the 2005 ๐ŸŒŸ Act, large casinos can have a maximum of one hundred and fifty machines in any combination of categories Bโ€“D (subject ๐ŸŒŸ to a machine-to-table ratio of 5:1); small casinos can have a maximum of eighty machines in any combination of categories ๐ŸŒŸ Bโ€“D (subject to a machine-to-table ratio of 2:1).

Category A

Category A games were defined in preparation for the planned "Super Casinos". ๐ŸŒŸ Despite a lengthy bidding process with Manchester being chosen as the single planned location, the development was cancelled soon after ๐ŸŒŸ Gordon Brown became Prime Minister of the United Kingdom. As a result, there are no lawful Category A games in ๐ŸŒŸ the U.K.

Category B

Category B games are divided into subcategories. The differences between B1, B3 and B4 games are mainly the ๐ŸŒŸ stake and prizes as defined in the above table. Category B2 games โ€“ Fixed odds betting terminals (FOBTs) โ€“ have ๐ŸŒŸ quite different stake and prize rules: FOBTs are mainly found in licensed betting shops, or bookmakers, usually in the form ๐ŸŒŸ of electronic roulette.

The games are based on a random number generator; thus each game's probability of getting the jackpot is ๐ŸŒŸ independent of any other game: probabilities are all equal. If a pseudorandom number generator is used instead of a truly ๐ŸŒŸ random one, probabilities are not independent since each number is determined at least in part by the one generated before ๐ŸŒŸ it.

Category C

Category C games are often referred to as fruit machines, one-armed bandits and AWP (amusement with prize). Fruit machines ๐ŸŒŸ are commonly found in pubs, clubs, and arcades. Machines commonly have three but can be found with four or five ๐ŸŒŸ reels, each with 16โ€“24 symbols printed around them. The reels are spun each play, from which the appearance of particular ๐ŸŒŸ combinations of symbols result in payment of their associated winnings by the machine (or alternatively initiation of a subgame). These ๐ŸŒŸ games often have many extra features, trails and subgames with opportunities to win money; usually more than can be won ๐ŸŒŸ from just the payouts on the reel combinations.

Fruit machines in the U.K. almost universally have the following features, generally selected ๐ŸŒŸ at random using a pseudorandom number generator:

A player (known in the industry as a punter ) may be given the ๐ŸŒŸ opportunity to hold one or more reels before spinning, meaning they will not be spun but instead retain their displayed ๐ŸŒŸ symbols yet otherwise count normally for that play. This can sometimes increase the chance of winning, especially if two or ๐ŸŒŸ more reels are held.

) may be given the opportunity to one or more reels before spinning, meaning they will not ๐ŸŒŸ be spun but instead retain their displayed symbols yet otherwise count normally for that play. This can sometimes increase the ๐ŸŒŸ chance of winning, especially if two or more reels are held. A player may also be given a number of ๐ŸŒŸ nudges following a spin (or, in some machines, as a result in a subgame). A nudge is a step rotation ๐ŸŒŸ of a reel chosen by the player (the machine may not allow all reels to be nudged for a particular ๐ŸŒŸ play).

following a spin (or, in some machines, as a result in a subgame). A nudge is a step rotation of ๐ŸŒŸ a reel chosen by the player (the machine may not allow all reels to be nudged for a particular play). ๐ŸŒŸ Cheats can also be made available on the internet or through emailed newsletters to subscribers. These cheats give the player ๐ŸŒŸ the impression of an advantage, whereas in reality the payout percentage remains exactly the same. The most widely used cheat ๐ŸŒŸ is known as hold after a nudge and increases the chance that the player will win following an unsuccessful nudge. ๐ŸŒŸ Machines from the early 1990s did not advertise the concept of hold after a nudge when this feature was first ๐ŸŒŸ introduced, it became so well known amongst players and widespread amongst new machine releases that it is now well-advertised on ๐ŸŒŸ the machine during play. This is characterized by messages on the display such as DON'T HOLD ANY or LET 'EM ๐ŸŒŸ SPIN and is a designed feature of the machine, not a cheat at all. Holding the same pair three times ๐ŸŒŸ on three consecutive spins also gives a guaranteed win on most machines that offer holds.

It is known for machines to ๐ŸŒŸ pay out multiple jackpots, one after the other (this is known as a "repeat") but each jackpot requires a new ๐ŸŒŸ game to be played so as not to violate the law about the maximum payout on a single play. Typically ๐ŸŒŸ this involves the player only pressing the Start button at the "repeat" prompt, for which a single credit is taken, ๐ŸŒŸ regardless of whether this causes the reels to spin or not. Machines are also known to intentionally set aside money, ๐ŸŒŸ which is later awarded in a series of wins, known as a "streak". The minimum payout percentage is 70%, with ๐ŸŒŸ pubs often setting the payout at around 78%.

Japan

Japanese slot machines, known as pachisuro (ใƒ‘ใƒใ‚นใƒญ) or pachislot from the words "pachinko" ๐ŸŒŸ and "slot machine", are a descendant of the traditional Japanese pachinko game. Slot machines are a fairly new phenomenon and ๐ŸŒŸ they can be found mostly in pachinko parlors and the adult sections of amusement arcades, known as game centers.

The machines ๐ŸŒŸ are regulated with integrated circuits, and have six different levels changing the odds of a 777. The levels provide a ๐ŸŒŸ rough outcome of between 90% and 160% (200% for skilled players). Japanese slot machines are "beatable". Parlor operators naturally set ๐ŸŒŸ most machines to simply collect money, but intentionally place a few paying machines on the floor so that there will ๐ŸŒŸ be at least someone winning,[citation needed] encouraging players on the losing machines to keep gambling, using the psychology of the ๐ŸŒŸ gambler's fallacy.

Despite the many varieties of pachislot machines, there are certain rules and regulations put forward by the Security Electronics ๐ŸŒŸ and Communication Technology Association (ไฟๅฎ‰้›ปๅญ้€šไฟกๆŠ€่ก“ๅ”ไผš), an affiliate of the National Police Agency. For example, there must be three reels. All ๐ŸŒŸ reels must be accompanied by buttons which allow players to manually stop them, reels may not spin faster than 80 ๐ŸŒŸ RPM, and reels must stop within 0.19 seconds of a button press. In practice, this means that machines cannot let ๐ŸŒŸ reels slip more than 4 symbols. Other rules include a 15 coin payout cap, a 50 credit cap on machines, ๐ŸŒŸ a 3 coin maximum bet, and other such regulations.[citation needed]

Although a 15 coin payout may seem quite low, regulations allow ๐ŸŒŸ "Big Bonus" (c. 400โ€“711 coins) and "Regular Bonus" modes (c. 110 coins) where these 15 coin payouts occur nearly continuously ๐ŸŒŸ until the bonus mode is finished. While the machine is in bonus mode, the player is entertained with special winning ๐ŸŒŸ scenes on the LCD display, and energizing music is heard, payout after payout.

Three other unique features of Pachisuro machines are ๐ŸŒŸ "stock", "renchan", and tenjล (ๅคฉไบ•). On many machines, when enough money to afford a bonus is taken in, the bonus ๐ŸŒŸ is not immediately awarded. Typically the game merely stops making the reels slip off the bonus symbols for a few ๐ŸŒŸ games. If the player fails to hit the bonus during these "standby games", it is added to the "stock" for ๐ŸŒŸ later collection. Many current games, after finishing a bonus round, set the probability to release additional stock (gained from earlier ๐ŸŒŸ players failing to get a bonus last time the machine stopped making the reels slip for a bit) very high ๐ŸŒŸ for the first few games. As a result, a lucky player may get to play several bonus rounds in a ๐ŸŒŸ row (a "renchan"), making payouts of 5,000 or even 10,000 coins possible. The lure of "stock" waiting in the machine, ๐ŸŒŸ and the possibility of "renchan" tease the gambler to keep feeding the machine. To tease them further, there is a ๐ŸŒŸ tenjล (ceiling), a maximum limit on the number of games between "stock" release. For example, if the tenjล is 1,500, ๐ŸŒŸ and the number of games played since the last bonus is 1,490, the player is guaranteed to release a bonus ๐ŸŒŸ within just 10 games.

Because of the "stock", "renchan", and tenjล systems, it is possible to make money by simply playing ๐ŸŒŸ machines on which someone has just lost a huge amount of money. This is called being a "hyena". They are ๐ŸŒŸ easy to recognize, roaming the aisles for a "kamo" ("sucker" in English) to leave his machine.

In short, the regulations allowing ๐ŸŒŸ "stock", "renchan", and tenjล transformed the pachisuro from a low-stakes form of entertainment just a few years back to hardcore ๐ŸŒŸ gambling. Many people may be gambling more than they can afford, and the big payouts also lure unsavory "hyena" types ๐ŸŒŸ into the gambling halls.

To address these social issues, a new regulation (Version 5.0) was adopted in 2006 which caps the ๐ŸŒŸ maximum amount of "stock" a machine can hold to around 2,000โ€“3,000 coins' worth of bonus games. Moreover, all pachisuro machines ๐ŸŒŸ must be re-evaluated for regulation compliance every three years. Version 4.0 came out in 2004, so that means all those ๐ŸŒŸ machines with the up to 10,000 coin payouts will be removed from service by 2007.[citation needed]

Jackpot disputes

Electronic slot machines can ๐ŸŒŸ malfunction. When the displayed amount is smaller than the one it is supposed to be, the error usually goes unnoticed. ๐ŸŒŸ When it happens the other way, disputes are likely.[47] Below are some notable arguments caused by the owners of the ๐ŸŒŸ machines saying that the displayed amounts were far larger than the ones patrons should get.

United States

Two such cases occurred in ๐ŸŒŸ casinos in Colorado in 2010, where software errors led to indicated jackpots ofR$11 million[48] andR$42 million.[49] Analysis of machine records ๐ŸŒŸ by the state Gaming Commission revealed faults, with the true jackpot being substantially smaller.[50] State gaming laws did not require ๐ŸŒŸ a casino to honour payouts in that case.

Vietnam

On October 25, 2009, while a Vietnamese American man, Ly Sam, was playing ๐ŸŒŸ a slot machine in the Palazzo Club at the Sheraton Saigon Hotel in Ho Chi Minh City, Vietnam, it displayed ๐ŸŒŸ that he had hit a jackpot of US$55,542,296.73.[51] The casino refused to pay, saying it was a machine error, Ly ๐ŸŒŸ sued the casino.[52] On January 7, 2013, the District 1 People's Court in Ho Chi Minh City decided that the ๐ŸŒŸ casino had to pay the amount Ly claimed in full, not trusting the error report from an inspection company hired ๐ŸŒŸ by the casino.[53] Both sides appealed thereafter, and Ly asked for interest while the casino refused to pay him.[54] In ๐ŸŒŸ January, 2014, the news reported that the case had been settled out of court, and Ly had received an undisclosed ๐ŸŒŸ sum.[55]

Problem gambling and slot machines

Mills Novelty Co. Horse Head Bonus antique slot machine

Natasha Dow Schรผll, associate professor in New York ๐ŸŒŸ University's Department of Media, Culture and Communication, uses the term "machine zone" to describe the state of immersion that users ๐ŸŒŸ of slot machines experience when gambling, where they lose a sense of time, space, bodily awareness, and monetary value.[56]

Mike Dixon, ๐ŸŒŸ PhD, professor of psychology at the University of Waterloo,[57] studies the relationship between slot players and machines. In one of ๐ŸŒŸ Dixon's studies, players were observed experiencing heightened arousal from the sensory stimulus coming from the machines. They "sought to show ๐ŸŒŸ that these 'losses disguised as wins' (LDWs) would be as arousing as wins, and more arousing than regular losses."[58]

Psychologists Robert ๐ŸŒŸ Breen and Marc Zimmerman[59][60] found that players of video slot machines reach a debilitating level of involvement with gambling three ๐ŸŒŸ times as rapidly as those who play traditional casino games, even if they have engaged in other forms of gambling ๐ŸŒŸ without problems.

Eye-tracking research in local bookkeepers' offices in the UK suggested that, in slots games, the reels dominated players' visual ๐ŸŒŸ attention, and that problem gamblers looked more frequently at amount-won messages than did those without gambling problems.[61]

The 2011 60 Minutes ๐ŸŒŸ report "Slot Machines: The Big Gamble"[62] focused on the link between slot machines and gambling addiction.

See also

References

Bibliography


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