Easy to Learn

82% to 98% payout to players
For some people slot machines are boring

They’re Inconsistent

A slot machine, known also as a fruit machine, puggy, the slots, poker machine, or just slot, is a casino gaming machine that produces a game of chance for its consumers. Slot machines are also called one-armed bandits due to the big mechanical levers attached to the sides of early mechanical machines.

3 reel slots are the ancestors of today’s modern video slots, which evolved in 5 or even 7 reel slots that “spin” when the game is activated. Also, the mechanics of early machines have been superseded by random number generators – the majority of are now operated using push-buttons and touchscreens.

Despite the fact that slot machines are straightforward, it’s worth taking a couple of minutes to understand how they work. Continue reading as our professionals expose everything you need and want to learn about slot machines.


Historically, all slot machines used revolving mechanical reels to show and determine results. Although the original slot machine used 5 reels, simpler, and for that reason more reliable, 3 reel machines quickly ended up being the standard.

An issue with 3 reel machines is that the number of combinations was limited making the machine very high risk, and also quite boring. Although the number of symbols eventually increased to about 22, permitting 10,648 combinations, this still limited jackpot sizes along with the number of possible results.

In the 1980s, slot machine manufacturers integrated electronics into their products and programmed them to weight particular symbols. Thus the chances of losing symbols appearing on the payline ended up being disproportionate to their real frequency on the physical reel.

With microprocessors, the computer systems inside modern-day slot machines enable manufacturers to assign a various probability to every symbol on every reel. To the player it may appear that a winning symbol was “so close”, whereas in fact the probability is much lower.

Machines embodying microprocessors ended up being standard. These used a number of functions to make sure the payout was controlled within the limits of the gambling legislation. As a coin was inserted into the machine, it could go either straight into the cashbox for the benefit of the owner or into a channel that formed the payout reservoir, with the microprocessor keeping track of the number of coins in this channel. This enabled the system to control the level of payout by stopping the drums at positions it had determined.

Video slot machines
Video slot machines do not use mechanical reels, instead using graphical reels on a computerized display screen. As there are no mechanical restrictions on the design of video slot machines, games typically use a minimum of 5 reels, and might also use non-standard designs. This considerably broadens the number of possibilities: a machine can have 50 or more symbols on a reel, giving odds as high as 300 million to 1 against – enough for even the biggest jackpot. Video slot machines normally make more extensive use of multimedia, and can include more elaborate minigames as bonus offers.


AutospinA feature that enables plays to automatically set the number of spins within a game.
BetThe total amount of money wagered on any spin.
Bet MaxThe bet max refers to the maximum number of credits on a slot game that a player can bet on each spin.
Bet MinThe bet min refers to the minimum number of credits that can be bet on a slot machine during each spin.
Bonus FeatureBonus features include wild cards, symbols and free spins.
Bonus Multiplier Slot MachinesBonus multiplier slots are slot machines offering larger jackpots to entice players to bet the maximum number of credits.
Bonus RoundA special feature which offers free games or instant cash wins.
Cash OutWhen you are done playing a slot, you can convert your credits back into real money. 
Certified SlotsCertified slots are those machines that casinos guarantee have a payout of 98%-100%.
Coin In / Coin OutCoin in and coin out refer to the number of credits or units both played and paid out. Coin in is the number of units played and coin out is the number of units won.
CoinsCoins for slots come in many denominations from a one cent to one dollar or more.
Coin SizeThe set amount of money a player must put in order to play that specific game. Different machines will have different betting amounts per payline.
Collect ButtonCollect is usually a button or an option on the slot that enables the slots player to convert their credits/coins into cash.
CreditsCoins are converted into credits to once they are in the game. For example, on a penny slot machine, when a pound is inserted, the player will then have twenty credits on that game.
Credit MeterA visual display of the amount of credits in the machine at any given time. 
Free SpinAn additional spin offered for free usually as part of a bonus feature on a bonus slot machine.
Hit FrequencyHow often a particular game pays out on average.
Hold PercentageThe hold percentage refers the amount of the players’ money the casino keeps. For example, a 99% slot machine keeps 1 dollar while returning 99 dollars back to the player.
JackpotA jackpot is the top prize or the highest amount of winnings that a slot machine can pay out.
MultiplierA special symbol which increases the payout if it is part of a winning payline. Multiplier symbols can be x2, x3, x4 and even more. 
Multi-LineSlots with more than one payline. Modern video slots usually have numerous paylines. 
Multi-WayWith multi-way slots, it doesn’t matter whether your winning symbols align from left to right or from right to left. Multi-way pays can increase the odds of winning drastically.
Near MissWhen you just miss out on a winning combination at a slot machine, it is referred to as a near miss.
NudgeA bonus feature which would allow you to move the slot reels up or down.
One-LinerA one-liner is a slot machines term that refers to games with only one reel where players line up three symbols to win.
Payback PercentageThe payback percentage is a reference to the amount of money a slot game should return to players over a period of time.
PaylineThe payline is the line at which winning combinations on the slot reels must land in order to win the payout amount.
PaytableAlso known as ‘payout table’. Lists the amounts you will win for the different symbol combinations.
Progressive Slot MachinesProgressive slots have a jackpot that continues to grow until it is won.
Sound of RainThe sound of rain is slot terminology for the sound of the coins dropping when a slots player cashes out.
SpinThe spin button or pulling the lever on the side of the machine activates the spinning of the reels to kick off the slot game experience.
Stacked SymbolsWhen the same symbol is on top of each other, either covering most or all of the reel.
Stacked WildsAlternating wild symbols that appear on top of one another.
SymbolsThe symbols are the different pictures or graphics on the various slot reels. These symbols include cherries and pound signs as well as sevens and money bags. They can also include images of movie or game characters based on the theme of the machine.
Two LinerA two-liner refers to slot machines that have two reels where players not only have to line up three symbols but line up six symbols.
WildIn many slots, the player will have the opportunity to hit a wild symbol. This symbol will substitute for any other symbol in the game, except bonus symbols or scatters, and allows for extra wins. 
WinWhen the correct combination of symbols appears on an activated pay line, the player will be awarded a win.

Payout percentage

Slot machines are usually configured to pay out as payouts 82% to 98% of the money that is bet by players. This is called the “theoretical payout percentage” or RTP – “return to player”. The minimum theoretical payout percentage differs among jurisdictions and is usually established by law or regulation. The amounts they pay and the frequencies of those payouts are carefully chosen to yield a specific fraction of the money payed to the “house” (the operator of the slot machine) while returning the rest to the players during play.

How to play Slots


Line identical symbols in a row to win.

How to play Slots

  1. Set a budget

    Set a budget in advance and stick to it

  2. Choose slot machine

    Take a look at the game’s paytable. This will show you how much each symbol is worth and let you understand its payouts

  3. Place a bet

    Load up your machine. Choose how many paylines you’d like to play, hit the button, stay cool and have fun

  4. Continue playing

    You can continue spinning the reels for as long as you wish, but don’t forget to keep an eye on your bankroll

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