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MS or PhD strongly preferred. The added advantage is that these large jackpots increase the excitement of the other players.

This game, in its original form, is obsolete, so these specific probabilities do not apply. He only published the odds after a fan of his sent him some information provided on a slot machine that was posted on a machine in the Netherlands.

The psychology of the machine design is quickly revealed. There are 13 possible payouts ranging from to 2, The payout comes every 8 plays.

The payout comes every 33 plays, whereas the payout comes every plays. Most players assume the likelihood increases proportionate to the payout.

The one mid-size payout that is designed to give the player a thrill is the payout. It is programmed to occur an average of once every plays.

The payout is high enough to create excitement, but not high enough that it makes it likely that the player will take his winnings and abandon the game.

In contrast the payout occurs only on average of once every 6, plays. The player who continues to feed the machine is likely to have several mid-size payouts, but unlikely to have a large payout.

He quits after he is bored or has exhausted his bankroll. Despite their confidentiality, occasionally a PAR sheet is posted on a website.

They have limited value to the player, because usually a machine will have 8 to 12 different possible programs with varying payouts. In addition, slight variations of each machine e.

The casino operator can choose which EPROM chip to install in any particular machine to select the payout desired.

The result is that there is not really such a thing as a high payback type of machine, since every machine potentially has multiple settings.

Without revealing the proprietary information, he developed a program that would allow him to determine with usually less than a dozen plays on each machine which EPROM chip was installed.

Then he did a survey of over machines in 70 different casinos in Las Vegas. He averaged the data, and assigned an average payback percentage to the machines in each casino.

The resultant list was widely publicized for marketing purposes especially by the Palms casino which had the top ranking.

One reason that the slot machine is so profitable to a casino is that the player must play the high house edge and high payout wagers along with the low house edge and low payout wagers.

Other bets have a higher house edge, but the player is rewarded with a bigger win up to thirty times in craps. The player can choose what kind of wager he wants to make.

A slot machine does not afford such an opportunity. Theoretically, the operator could make these probabilities available, or allow the player to choose which one so that the player is free to make a choice.

However, no operator has ever enacted this strategy. Different machines have different maximum payouts, but without knowing the odds of getting the jackpot, there is no rational way to differentiate.

In many markets where central monitoring and control systems are used to link machines for auditing and security purposes, usually in wide area networks of multiple venues and thousands of machines, player return must usually be changed from a central computer rather than at each machine.

A range of percentages is set in the game software and selected remotely. In , the Nevada Gaming Commission began working with Las Vegas casinos on technology that would allow the casino's management to change the game, the odds, and the payouts remotely.

The change cannot be done instantaneously, but only after the selected machine has been idle for at least four minutes.

After the change is made, the machine must be locked to new players for four minutes and display an on-screen message informing potential players that a change is being made.

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

In some cases multiple machines are linked across multiple casinos. In these cases, the machines may be owned by the manufacturer, who is responsible for paying the jackpot.

The casinos lease the machines rather than owning them outright. Casinos in New Jersey, Nevada, and South Dakota now offer multi-state progressive jackpots, which now offer bigger jackpot pools.

Mechanical slot machines and their coin acceptors were sometimes susceptible to cheating devices and other scams.

One historical example involved spinning a coin with a short length of plastic wire. The weight and size of the coin would be accepted by the machine and credits would be granted.

However, the spin created by the plastic wire would cause the coin to exit through the reject chute into the payout tray. This particular scam has become obsolete due to improvements in newer slot machines.

Another obsolete method of defeating slot machines was to use a light source to confuse the optical sensor used to count coins during payout. Modern slot machines are controlled by EPROM computer chips and, in large casinos, coin acceptors have become obsolete in favor of bill acceptors.

These machines and their bill acceptors are designed with advanced anti-cheating and anti-counterfeiting measures and are difficult to defraud.

Early computerized slot machines were sometimes defrauded through the use of cheating devices, such as the "slider" or "monkey paw".

Computerized slot machines are fully deterministic and thus outcomes can be sometimes successfully predicted. Malfunctioning electronic slot machines are capable of indicating jackpot winnings far in excess of those advertised.

In the United States, the public and private availability of slot machines is highly regulated by state governments.

Many states have established gaming control boards to regulate the possession and use of slot machines and other form of gaming. Nevada is the only state that has no significant restrictions against slot machines both for public and private use.

In New Jersey , slot machines are only allowed in hotel casinos operated in Atlantic City. Several states Indiana , Louisiana and Missouri allow slot machines as well as any casino-style gambling only on licensed riverboats or permanently anchored barges.

Since Hurricane Katrina , Mississippi has removed the requirement that casinos on the Gulf Coast operate on barges and now allows them on land along the shoreline.

Delaware allows slot machines at three horse tracks; they are regulated by the state lottery commission. In Wisconsin, bars and taverns are allowed to have up to five machines.

These machines usually allow a player to either take a payout, or gamble it on a double-or-nothing "side game". The territory of Puerto Rico places significant restrictions on slot machine ownership, but the law is widely flouted and slot machines are common in bars and coffeeshops.

In regards to tribal casinos located on Native American reservations , slot machines played against the house and operating independently from a centralized computer system are classified as "Class III" gaming by the Indian Gaming Regulatory Act IGRA , and sometimes promoted as "Vegas-style" slot machines.

As a workaround, some casinos may operate slot machines as "Class II" games—a category that includes games where players play exclusively against at least one other opponent and not the house, such as bingo or any related games such as pull-tabs.

In these cases, the reels are an entertainment display with a pre-determined outcome based on a centralized game played against other players.

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

Conversely, in Connecticut , Hawaii , Nebraska , South Carolina , and Tennessee , private ownership of any slot machine is completely prohibited.

The remaining states allow slot machines of a certain age typically 25—30 years or slot machines manufactured before a specific date. For a detailed list of state-by-state regulations on private slot machine ownership, see U.

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

OLG piloted a classification system for slot machines at the Grand River Raceway developed by University of Waterloo professor Kevin Harrigan, as part of its PlaySmart initiative for responsible gambling.

Inspired by nutrition labels on foods, they displayed metrics such as volatility and frequency of payouts. In Australia "Poker Machines" or "pokies" [39] are officially termed "gaming machines".

In Australia, gaming machines are a matter for state governments, so laws vary between states. Gaming machines are found in casinos approximately one in each major city , pubs and clubs in some states usually sports, social, or RSL clubs.

The first Australian state to legalize this style of gambling was New South Wales , when in they were made legal in all registered clubs in the state.

There are suggestions that the proliferation of poker machines has led to increased levels of problem gambling ; however, the precise nature of this link is still open to research.

Australia ranks 8th in total number of gaming machines after Japan, U. This primarily is because gaming machines have been legal in the state of New South Wales since ; over time, the number of machines has grown to 97, at December , including the Australian Capital Territory.

By way of comparison, the U. State of Nevada, which legalised gaming including slots several decades before N. This new law also banned machines with an automatic play option.

All gaming machines in Victoria have an information screen accessible to the user by pressing the "i key" button, showing the game rules, paytable, return to player percentage, and the top and bottom five combinations with their odds.

These combinations are stated to be played on a minimum bet usually 1 credit per line, with 1 line or reel played, although some newer machines do not have an option to play 1 line; some machines may only allow maximum lines to be played , excluding feature wins.

Western Australia has the most restrictive regulations on electronic gaming machines in general, with the Crown Perth casino resort being the only venue allowed to operate them, [42] and banning slot machines with spinning reels entirely.

This policy had an extensive political history, reaffirmed by the Royal Commission into Gambling: [43]. Poker machine playing is a mindless, repetitive and insidious form of gambling which has many undesirable features.

It requires no thought, no skill or social contact. The odds are never about winning. Watching people playing the machines over long periods of time, the impressionistic evidence at least is that they are addictive to many people.

Historically poker machines have been banned from Western Australia and we consider that, in the public interest, they should stay banned.

While Western Australian gaming machines are similar to the other states', they do not have spinning reels.

Therefore different animations are used in place of the spinning reels in order to display each game result. Independent candidate Andrew Wilkie , an anti-pokies campaigner, was elected to the Australian House of Representatives seat of Denison at the federal election.

Wilkie was one of four crossbenchers who supported the Gillard Labor government following the hung parliament result. Wilkie immediately began forging ties with Xenophon as soon as it was apparent that he was elected.

During the Covid pandemic of , every establishment in the country that facilitated poker machines was shut down, in an attempt to curb the spread of the virus.

Bringing Australia's usage of poker machines effectively to zero. In Russia, "slot clubs" appeared quite late, only in Before , slot machines were only in casinos and small shops, but later slot clubs began appearing all over the country.

The most popular and numerous were "Vulcan " and "Taj Mahal". Since when gambling establishments were banned, almost all slot clubs disappeared and are found only in a specially authorized gambling zones.

Slot machines are covered by the Gambling Act , which superseded the Gaming Act Slot machines in the U.

Casinos built under the provisions of the Act are allowed to house either up to twenty machines of categories B—D or any number of C—D machines.

As defined by the Act, large casinos can have a maximum of one hundred and fifty machines in any combination of categories B—D subject to a machine-to-table ratio of ; small casinos can have a maximum of eighty machines in any combination of categories B—D subject to a machine-to-table ratio of Category A games were defined in preparation for the planned " Super Casinos ".

Despite a lengthy bidding process with Manchester being chosen as the single planned location, the development was cancelled soon after Gordon Brown became Prime Minister of the United Kingdom.

As a result, there are no lawful Category A games in the U. Category B games are divided into subcategories. The differences between B1, B3 and B4 games are mainly the stake and prizes as defined in the above table.

Category B2 games — Fixed odds betting terminals FOBTs — have quite different stake and prize rules: FOBTs are mainly found in licensed betting shops , or bookmakers, usually in the form of electronic roulette.

The games are based on a random number generator ; thus each game's probability of getting the jackpot is independent of any other game: probabilities are all equal.

If a pseudorandom number generator is used instead of a truly random one, probabilities are not independent since each number is determined at least in part by the one generated before it.

Category C games are often referred to as fruit machines , one-armed bandits and AWP amusement with prize. Fruit machines are commonly found in pubs , clubs , and arcades.

Machines commonly have three but can be found with four or five reels, each with 16—24 symbols printed around them.

The reels are spun each play, from which the appearance of particular combinations of symbols result in payment of their associated winnings by the machine or alternatively initiation of a subgame.

These games often have many extra features, trails and subgames with opportunities to win money; usually more than can be won from just the payouts on the reel combinations.

Fruit machines in the U. It is known for machines to pay out multiple jackpots, one after the other this is known as a streak or rave but each jackpot requires a new game to be played so as not to violate the law about the maximum payout on a single play.

Typically this involves the player only pressing the Start button for which a single credit is taken, regardless of whether this causes the reels to spin or not.

Slot machines are a fairly new phenomenon and they can be found mostly in pachinko parlors and the adult sections of amusement arcades , known as game centers.

The machines are regulated with integrated circuits , and have six different levels changing the odds of a Japanese slot machines are "beatable".

Parlor operators naturally set most machines to simply collect money, but intentionally place a few paying machines on the floor so that there will be at least someone winning, [ citation needed ] encouraging players on the losing machines to keep gambling, using the psychology of the gambler's fallacy.

For example, there must be three reels. All reels must be accompanied by buttons which allow players to manually stop them, reels may not spin faster than 80 RPM, and reels must stop within 0.

In practice, this means that machines cannot let reels slip more than 4 symbols. Other rules include a 15 coin payout cap, a 50 credit cap on machines, a 3 coin maximum bet, and other such regulations.

Although a 15 coin payout may seem quite low, regulations allow "Big Bonus" c. While the machine is in bonus mode, the player is entertained with special winning scenes on the LCD display, and energizing music is heard, payout after payout.

On many machines, when enough money to afford a bonus is taken in, the bonus is not immediately awarded. Typically the game merely stops making the reels slip off the bonus symbols for a few games.

If the player fails to hit the bonus during these "standby games", it is added to the "stock" for later collection.

Many current games, after finishing a bonus round, set the probability to release additional stock gained from earlier players failing to get a bonus last time the machine stopped making the reels slip for a bit very high for the first few games.

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Improve Communication Share your vision for the game with a working, playable, prototype. By , many "bell" machines had been installed in most cigar stores, saloons, bowling alleys, brothels and barber shops.

The first Liberty Bell machines produced by Mills used the same symbols on the reels as did Charles Fey's original. Soon afterward, another version was produced with patriotic symbols, such as flags and wreaths, on the wheels.

Later, a similar machine called the Operator's Bell was produced that included the option of adding a gum -vending attachment. As the gum offered was fruit-flavored, fruit symbols were placed on the reels: lemons, cherries, oranges and plums.

A bell was retained, and a picture of a stick of Bell-Fruit Gum, the origin of the bar symbol, was also present.

This set of symbols proved highly popular and was used by other companies that began to make their own slot machines: Caille, Watling, Jennings and Pace.

A commonly used technique to avoid gambling laws in a number of states was to award food prizes. For this reason, a number of gumball and other vending machines were regarded with mistrust by the courts.

The two Iowa cases of State v. Ellis [11] and State v. Striggles [12] are both used in criminal law classes to illustrate the concept of reliance upon authority as it relates to the axiomatic ignorantia juris non excusat "ignorance of the law is no excuse".

Despite the display of the result of the next use on the machine, the courts ruled that "[t]he machine appealed to the player's propensity to gamble, and that is [a] vice.

In , Bally developed the first fully electromechanical slot machine called Money Honey although earlier machines such as Bally's High Hand draw-poker machine had exhibited the basics of electromechanical construction as early as Its electromechanical workings made Money Honey the first slot machine with a bottomless hopper and automatic payout of up to coins without the help of an attendant.

The prototype was mounted in a full-size, show-ready slot-machine cabinet. The first production units went on trial at the Las Vegas Hilton Hotel.

After some modifications to defeat cheating attempts, the video slot machine was approved by the Nevada State Gaming Commission and eventually found popularity on the Las Vegas Strip and in downtown casinos.

Fortune Coin Co. Depending on the machine, the player can insert cash or, in " ticket-in, ticket-out " machines, a paper ticket with a barcode , into a designated slot on the machine.

The machine is then activated by means of a lever or button either physical or on a touchscreen , which activates reels that spin and stop to rearrange the symbols.

If a player matches a winning combination of symbols, the player earns credits based on the paytable. Symbols vary depending on the theme of the machine.

Classic symbols include objects such as fruits, bells, and stylized lucky sevens. Most slot games have a theme, such as a specific aesthetic , location, or character.

Symbols and other bonus features of the game are typically aligned with the theme. Some themes are licensed from popular media franchises , including films, television series including game shows such as Wheel of Fortune , entertainers, and musicians.

Multi-line slot machines have become more popular since the s. These machines have more than one payline, meaning that visible symbols that are not aligned on the main horizontal may be considered as winning combinations.

Traditional three-reel slot machines commonly have one, three, or five paylines while video slot machines may have 9, 15, 25, or as many as different paylines.

Most accept variable numbers of credits to play, with 1 to 15 credits per line being typical. The higher the amount bet, the higher the payout will be if the player wins.

One of the main differences between video slot machines and reel machines is in the way payouts are calculated.

With reel machines, the only way to win the maximum jackpot is to play the maximum number of coins usually three, sometimes four or even five coins per spin.

With video machines, the fixed payout values are multiplied by the number of coins per line that is being bet.

In other words: on a reel machine, the odds are more favorable if the gambler plays with the maximum number of coins available.

Multi-way games may be configured to allow players to bet by-reel: for example, on a game with a 3x5 pattern often referred to as a way game , playing one reel allows all three symbols in the first reel to potentially pay, but only the center row pays on the remaining reels often designated by darkening the unused portions of the reels.

Other multi-way games use a 4x5 or 5x5 pattern, where there are up to five symbols in each reel, allowing for up to 1, and 3, ways to win respectively.

A variation involves patterns where symbols pay adjacent to one another. Most of these games have a hexagonal reel formation, and much like multi-way games, any patterns not played are darkened out of use.

The latter are typically known as "high limit" machines, and machines configured to allow for such wagers are often located in dedicated areas which may have a separate team of attendants to cater to the needs of those who play there.

The machine automatically calculates the number of credits the player receives in exchange for the cash inserted. Newer machines often allow players to choose from a selection of denominations on a splash screen or menu.

A bonus is a special feature of the particular game theme, which is activated when certain symbols appear in a winning combination. Bonuses and the number of bonus features vary depending upon the game.

In other bonus rounds, the player is presented with several items on a screen from which to choose. As the player chooses items, a number of credits is revealed and awarded.

Some bonuses use a mechanical device, such as a spinning wheel, that works in conjunction with the bonus to display the amount won.

A candle is a light on top of the slot machine. It flashes to alert the operator that change is needed, hand pay is requested or a potential problem with the machine.

It can be lit by the player by pressing the "service" or "help" button. A coin hopper is a container where the coins that are immediately available for payouts are held.

When a certain preset coin capacity is reached, a coin diverter automatically redirects, or "drops", excess coins into a "drop bucket" or "drop box".

Unused coin hoppers can still be found even on games that exclusively employ Ticket-In, Ticket-Out technology, as a vestige.

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

The drop bucket or drop box is a container located in a slot machine's base where excess coins are diverted from the hopper.

Typically, a drop bucket is used for low-denomination slot machines and a drop box is used for high-denomination slot machines.

A drop box contains a hinged lid with one or more locks whereas a drop bucket does not contain a lid. The contents of drop buckets and drop boxes are collected and counted by the casino on a scheduled basis.

Free spins are a common form of bonus, where a series of spins are automatically played at no charge at the player's current wager.

Free spins are usually triggered via a scatter of at least three designated symbols with the number of spins dependent on the number of symbols that land.

Some games allow the free spins bonus to "retrigger", which adds additional spins on top of those already awarded. There is no theoretical limit to the number of free spins obtainable.

Some games may have other features that can also trigger over the course of free spins. A hand pay refers to a payout made by an attendant or at an exchange point "cage" , rather than by the slot machine itself.

A hand pay occurs when the amount of the payout exceeds the maximum amount that was preset by the slot machine's operator.

Usually, the maximum amount is set at the level where the operator must begin to deduct taxes. A hand pay could also be necessary as a result of a short pay.

Hopper fill slip is a document used to record the replenishment of the coin in the coin hopper after it becomes depleted as a result of making payouts to players.

The slip indicates the amount of coin placed into the hoppers, as well as the signatures of the employees involved in the transaction, the slot machine number and the location and the date.

MEAL book M achine e ntry a uthorization l og is a log of the employee's entries into the machine. Low-level or slant-top slot machines include a stool so the player may sit down.

Stand-up or upright slot machines are played while standing. Optimal play is a payback percentage based on a gambler using the optimal strategy in a skill-based slot machine game.

Payline is a line that crosses through one symbol on each reel, along which a winning combination is evaluated. Classic spinning reel machines usually have up to nine paylines, while video slot machines may have as many as one hundred.

Paylines could be of various shapes horizontal, vertical, oblique, triangular, zigzag, etc. Persistent state refers to passive features on some slot machines, some of which able to trigger bonus payouts or other special features if certain conditions are met over time by players on that machine.

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

Short pay refers to a partial payout made by a slot machine, which is less than the amount due to the player.

This occurs if the coin hopper has been depleted as a result of making earlier payouts to players. The remaining amount due to the player is either paid as a hand pay or an attendant will come and refill the machine.

A scatter is a pay combination based on occurrences of a designated symbol landing anywhere on the reels, rather than falling in sequence on the same payline.

A scatter pay usually requires a minimum of three symbols to land, and the machine may offer increased prizes or jackpots depending on the number that land.

Scatters are frequently used to trigger bonus games, such as free spins with the number of spins multiplying based on the number of scatter symbols that land.

The scatter symbol usually cannot be matched using wilds, and some games may require the scatter symbols to appear on consecutive reels in order to pay.

On some multiway games, scatter symbols still pay in unused areas. Taste is a reference to the small amount often paid out to keep a player seated and continuously betting.

Only rarely will machines fail to pay even the minimum out over the course of several pulls. Tilt is a term derived from electromechanical slot machines' " tilt switches ", which would make or break a circuit when they were tilted or otherwise tampered with that triggered an alarm.

While modern machines no longer have tilt switches, any kind of technical fault door switch in the wrong state, reel motor failure, out of paper, etc.

A theoretical hold worksheet is a document provided by the manufacturer for every slot machine that indicates the theoretical percentage the machine should hold based on the amount paid in.

The worksheet also indicates the reel strip settings, number of coins that may be played, the payout schedule, the number of reels and other information descriptive of the particular type of slot machine.

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

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

Wild symbols substitute for most other symbols in the game similarly to a joker card , usually excluding scatter and jackpot symbols or offering a lower prize on non-natural combinations that include wilds.

How jokers behave are dependent on the specific game and whether the player is in a bonus or free games mode. Sometimes wild symbols may only appear on certain reels, or have a chance to "stack" across the entire reel.

Each machine has a table that lists the number of credits the player will receive if the symbols listed on the pay table line up on the pay line of the machine.

Some symbols are wild and can represent many, or all, of the other symbols to complete a winning line. Especially on older machines, the pay table is listed on the face of the machine, usually above and below the area containing the wheels.

On video slot machines, they are usually contained within a help menu, along with information on other features. Historically, all slot machines used revolving mechanical reels to display and determine results.

Although the original slot machine used five reels, simpler, and therefore more reliable, three reel machines quickly became the standard.

This limited the manufacturer's ability to offer large jackpots since even the rarest event had a likelihood of 0. Although the number of symbols eventually increased to about 22, allowing 10, combinations, [20] this still limited jackpot sizes as well as the number of possible outcomes.

In the s, however, slot machine manufacturers incorporated electronics into their products and programmed them to weight particular symbols. Thus the odds of losing symbols appearing on the payline became disproportionate to their actual frequency on the physical reel.

A symbol would only appear once on the reel displayed to the player, but could, in fact, occupy several stops on the multiple reel.

In Inge Telnaes received a patent for a device titled, "Electronic Gaming Device Utilizing a Random Number Generator for Selecting the Reel Stop Positions" US Patent , [21] which states: "It is important to make a machine that is perceived to present greater chances of payoff than it actually has within the legal limitations that games of chance must operate.

With microprocessors now ubiquitous, the computers inside modern slot machines allow manufacturers to assign a different probability to every symbol on every reel.

To the player it might appear that a winning symbol was "so close", whereas in fact the probability is much lower. In the s in the U.

These used a number of features to ensure the payout was controlled within the limits of the gambling legislation.

As a coin was inserted into the machine, it could go either directly into the cashbox for the benefit of the owner or into a channel that formed the payout reservoir, with the microprocessor monitoring the number of coins in this channel.

The drums themselves were driven by stepper motors, controlled by the processor and with proximity sensors monitoring the position of the drums.

A "look-up table" within the software allows the processor to know what symbols were being displayed on the drums to the gambler.

This allowed the system to control the level of payout by stopping the drums at positions it had determined. If the payout channel had filled up, the payout became more generous; if nearly empty, the payout became less so thus giving good control of the odds.

Video slot machines do not use mechanical reels, instead of using graphical reels on a computerized display. As there are no mechanical constraints on the design of video slot machines, games often use at least five reels, and may also use non-standard layouts.

This greatly expands the number of possibilities: a machine can have 50 or more symbols on a reel, giving odds as high as million to 1 against — enough for even the largest jackpot.

As there are so many combinations possible with five reels, manufacturers do not need to weight the payout symbols although some may still do so.

Instead, higher paying symbols will typically appear only once or twice on each reel, while more common symbols earning a more frequent payout will appear many times.

Video slot machines usually make more extensive use of multimedia , and can feature more elaborate minigames as bonuses. Modern cabinets typically use flat-panel displays , but cabinets using larger curved screens which can provide a more immersive experience for the player are not uncommon.

Video slot machines typically encourage the player to play multiple "lines": rather than simply taking the middle of the three symbols displayed on each reel, a line could go from top left to the bottom right or any other pattern specified by the manufacturer.

As each symbol is equally likely, there is no difficulty for the manufacturer in allowing the player to take as many of the possible lines on offer as desire — the long-term return to the player will be the same.

The difference for the player is that the more lines they play, the more likely they are to get paid on a given spin because they are betting more.

To avoid seeming as if the player's money is simply ebbing away whereas a payout of credits on a single-line machine would be bets and the player would feel they had made a substantial win, on a line machine, it would only be five bets and not seem as significant , manufacturers commonly offer bonus games, which can return many times their bet.

The player is encouraged to keep playing to reach the bonus: even if he is losing, the bonus game could allow then to win back their losses.

All modern machines are designed using pseudorandom number generators "PRNGs" , which are constantly generating a sequence of simulated random numbers, at a rate of hundreds or perhaps thousands per second.

As soon as the "Play" button is pressed, the most recent random number is used to determine the result. This means that the result varies depending on exactly when the game is played.

A fraction of a second earlier or later and the result would be different.

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