- The first somewhat new concept with respect to Slot Machines is that of a Licensed themed Slot Machine game, and we see these all of the time. With respect to Land-Based Casinos, some of the most popular titles are The Walking Dead, Sex and the City, Monopoly, Wheel of Fortune, Wizard of Oz, Britney Spears and a wide variety of others.
- This was the first US patent issued for a gambling machine and was the first to somewhat resemble what we now know as a modern slot machine. In fact, some historians have argued that Schultz, not Fey, should be the one known as the “Thomas Edison of slot machines.” We will come back to that later.
- When Appeared The First Slot Machines Come Out Yet
- When Appeared The First Slot Machines Come Out Every
- When Appeared The First Slot Machines Come Out Come Out
- When Appeared The First Slot Machines Come Out Now
Slots are the most popular of all casino games. Whether you play online or in a land-based casino, there are tons of exciting games to choose from. If you enjoy playing slots, have you ever wondered just how slot machines came into existence? Probably not, yet they have a rich history, with the first slot dating back over a hundred years!
When Appeared The First Slot Machines Come Out Yet
Throughout the decades, advances in technology have lead to an evolution of the games. In this article, I’ll take you through the journey of slot machines, from their origins to the exciting games we know today.
Sittman and Pitt – The Predecessor of the Slot Machine
In 1891, the New York based company Sittman and Pitt developed a card machine, which many consider to be a precursor to the first true slot machine. The machine was based on poker, using 50 card faces. The 10 of spades and the jack of hearts were typically removed from the deck, reducing the chances of a royal flush, increasing the house edge. The machine had 5 drums and it cost a nickel for a spin. Players would pull a lever to spin the drums and wins were awarded for lining up various poker hands. The game became hugely popular and could be found in many bars throughout the city. The Sittman and Pitt machine had no direct payout mechanism, and as such, prizes were determined by the establishment where the game was played. Typically prizes included free beers or cigars depending on the winning hand.
Liberty Bell – The First Real Slot Machine
Around 1895, the first true slot machine was created by Charles Fey, a car mechanic from San Francisco. Fey simplified the layout of the machine, reducing it to just 3 drums. The real breakthrough with Fey’s design was the possibility of automatic payouts for winning symbol combinations. The many cards of the Sittman and Pitt machine were replaced with just 5 symbols; diamonds, hearts, spades, horseshoes and a liberty bell. This made it easier to identify wins and make the automatic payouts. A combination of 3 cracked liberty bells provided the highest payout, and consequently gave the slot machine its name.
Liberty Bell – The First Real Slot Machine Around 1895, the first true slot machine was created by Charles Fey, a car mechanic from San Francisco. Fey simplified the layout of the machine, reducing it to just 3 drums. The real breakthrough with Fey’s design was the possibility of automatic payouts for winning symbol combinations.
Operators Bell – The Birth of the Fruit Machine
Demand for Fey’s slot machine was huge and as such, another developer entered the market with his own take on the popular gaming machine. Herbert Mills, a Chicago based manufacturer released his first slot machine, called the Operators Bell in 1907. This machine saw the introduction of fruit symbols, such as watermelons and cherries, which are still commonly found in classic slot machines. Owing to prohibition and gambling laws, slot machines could no longer pay out cash prizes. As such, many would pay out chewing gumballs and candies, typically relating to the winning fruit symbols. It was during this time that the BAR symbol was also introduced to the reels, which was the logo of the Bell-Fruit gum company.
Money Honey – The First Electromechanical Slot Machine
Slot machines remained popular throughout the years, with many manufacturers creating machines which could be found in bars, tobacconists and casinos. Yet the next major development in the evolution of slot machines can be pinpointed to 1963. It was then that the gaming machine manufacturer Bally released the first fully electromechanical slot machine. The Money Honey had an innovative new feature, a bottomless hopper. This enabled automatic payouts of up to 500 coins. This new type of slot machine did not need a lever to play, and as new electromechanical slots were created, the familiar lever was replaced with buttons.
Fortune Coin – The First Video Slot is Launched
In 1976, the first true video slot was released. It was created by the California based manufacturer, Fortune Coin Co. In a distinct change to the traditional set-up, a modified 19-inch Sony television screen was used for the display and logic boards were used for all the slot machine functions. The Fortune Coin was mounted in a full-sized slot machine cabinet and trialled at the Las Vegas Hilton hotel. The Nevada State Gambling Commission insisted upon numerous modifications of the original game to prevent cheating. It was then rolled out across the infamous Las Vegas strip where it gained huge popularity. In 1978, IGT acquired the Fortune Coin company and its video slot technology.
Online Slots – The New Way to Play
In the mid 1990’s, the boom of the internet led to the launch of the first online casinos. This led to a significant advancement in terms of slot machines. Very soon, slots dominated the game selection at online casinos and became the most popular choice for casino players. Nowadays, you can choose from hundreds of online slot machines. They boast a diverse range of themes and cutting-edge graphical and sound quality. Progressive jackpot slots pool together wagers on selected games across all casinos, providing the potential for life-changing prizes. Technological advancements mean there are many imaginative bonus rounds and innovative features as well as unusual and unconventional configurations. You can see some of the most popular innovative online slots below.
Reel Rush – Up to 3125 Ways to WinNetEnt’s Reel Rush provides up to 3125 ways to win, thanks to its unconventional gameplay, which unlocks more paylines with each consecutive line win you achieve.
Gonzo’s Quest – Cascading SymbolsThe innovative Avalanche feature in Gonzo’s Quest sees symbols fall into place on the reels. Winning symbols explode and new ones cascade down for a chance of more wins.
Bubble CrazeThis unique IGT slot has the feel of an arcade game. Bubble Craze has no reels, rows or paylines. Simply match coloured bubbles to win and pocket payouts.
Jack Hammer – Sticky WinsEach symbol spins independently in the Jack Hammer slot. The Sticky Win feature locks any winning symbols in place whilst the other reels re-spin, for a shot at bigger wins.
Siberian Storm – Unconventional LayoutIGT’s Siberian Storm slot has an unusual configuration, with differing numbers of rows across its 5 reels, producing a hexagonal shaped layout and MultiWay Xtra wins.
Mobile Slots – Gaming on the Go
Given the ever-increasing popularity of mobile gaming, producers of casino games have invested significantly in the development of mobile friendly slots in recent years. Many popular online slots have been optimised for mobile play, for an intuitive and engaging playing experience on the smaller display of a mobile phone or smartphone. By developing slots using HTML5 technology, mobile slots have a responsive design and are compatible with most modern devices running on iOS or Android operating systems. New slots are regularly released by game developers, with the majority simultaneously released for both mobile and desktop gaming.
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On this page, you'll find a comprehensive overview to answer the question, How Do Slot Machines Work? The original land-based slots machines that went onto to inspire a virtual gaming. Along with the gambling revolution in the form of the thousands of slots machines we all know and love. If you're new to the exciting world of slots machines this is the perfect place to start
We'll be touching on the history of slot machines. Showing you how do slot machines work. Taking an in-depth look at slot machine payouts and even debunking some slots machines myths.
Slots Explained!
So what exactly is a 'Slot machine'? You must know this in order to know how do slot machines work. Well at its very basic form, a slot machine is simply a 'one-armed bandit' type of machine. Where a player puts a coin in the slot and pulls the lever (or 'arm'). Or in the modern era simply presses a 'Spin' button to trigger reel spins. When the reels stop spinning the player may or may not win a prize depending on what particular symbols are showing.
Modern slots machines (also know as Pokies in Australia) can be found in casinos, bars etc all over the world. They're now a very well established and incredibly popular form of easy to play game. They make up a multi-billion dollar industry in their own right.
The History of Slots Machines

In order to help you understand how do slot machines work a little better. Let's take a look at the history of the slot machine. The history and development of slot machines is a fascinating subject in its own right. While we don't have space here to give you chapter and verse. It's well worth highlighting a few key moments.
Starting with what's considered to be the invention of the first of what we would recognize as the slot machine. When In 1887 Charles Fey built his 'Liberty Slots' machine. Complete with 3 spinning reels and 5 game symbols (diamonds, hearts, horseshoes, spades and the Liberty Bell). Fey probably couldn't have predicted the impact his machine would have on the world. Nor could he have guessed that his inspired choice of symbols would stand the test of time and remain in use in today's games well over 100 years later!
Fun fact: The Liberty Bell was the first ever jackpot symbol. 3 of these in a row was the highest payout for Fey's Liberty Bell game. With a top jackpot of fifty cents!
Fey's gaming machine proved incredibly popular. Variants on the basic setup soon followed. Including the mighty Operator Bell machine and games that awarded Fruit flavored gums as prizes. A response to strict anti-gambling laws which were brought in response to the growing popularity of slots machines. That prevented cash prizes and in some regions. Including San Francisco, Nevada, and California where there were outright bans. So the fruit symbols we know today such as cherry and melon appeared on the slots. Joined by the famous BAR symbol which was based on the logo of the Bell-Fruit Gum Company.
In 1963 Bally Technologies Inc developed Money Honey which is considered the world's first 'electromechanical slot machine'. Instead of operating solely via mechanical components. Modern electrical components were used in the design of the machine. To give players something new and exciting. As well as to breathe new life into what was in the early 1960s something of a moribund & declining industry.
Across the United States, casinos were actually reluctant to remove older stock to make way for Bally's new machine. However, any initial reluctance soon fell away. As operators saw their takings per machine increase by as much as 400%. With the electro-mechanical slots and by 1968, Bally was producing 94% of all the slot machines sold in the state of Nevada alone!
The first video slot made its debut in the mid-1970s in the form of Walt Fraley's Fortune Coin game and while it looked impressive (by 1970s standards). Players were initially skeptical of such a game due to the simulated reels and random number generators. Everyone understood that such machines could be programmed to favor the house.
IGT (International Game Technology) purchased the rights to Fortune Coin and turned out the multiple pay-line version in 1980. It turned out to be a good move as IGT are still in the business of slots to this day. Helped no doubt by increased consumer interest in home computer and arcade games. The electronic type of slots machines rapidly went from strength and strength. Soon they came to dominate the sector leaving the older electro-mechanical style slot machines in the dust (quite literally in many cases!)
Enough of the history lesson lets move on to how do slot machines work.
How Do Slot Machines Works
Bonus Symbols are symbols with the specific task of triggering bonus features. When they are part of a winning payline. The look of Bonus Symbols varies from game to game.
So let's take a look at how do slot machines work. Typically players will play a slot machine game with 3 reels or 5 reels. Players insert coins, starting from one Penny or Cent. This is to determine how much to wager and then press the 'Spin' button. Animation on the screen will show the reels (or actual reels will spin round in the case of older slots machines).
At the heart of every modern slot machine is the random number generator. Special software code that determines the outcome of your spins. The software that powers modern slots machines must meet strict legal and regulatory testing. To ensure fairness but, ultimately, the house always has the edge as they say.
Once the reels have stopped spinning. The games software will determine if and what the player has won. With wins usually accompanied by suitable sound FX and flashing lights or animations (in the case of video slots).
Different slots machines have different themes, prizes, symbols and features of course. In fact, there are thousands of variations of slot machines out there. With new games developed and released on a regular basis. Machines generally come in two types. Either a 'Classic' slot with 3 reels or a more advanced and feature rich 'Video' Slot with 5 reels.
Slot Machine Parts

Understanding the parts of a slot machine is fundamental to understanding how do slot machines work.
As you are no doubt aware. Today's slot machines come in both virtual (eg online browser-based games) and real-world land-based games. The likes of which you can find in casinos. In this section, we'll take a look at the common parts of both types of slots.
First up we have the reels which are obviously the most important part of any slot game! The reels are where you'll find the symbols for the games, of course. In modern virtual slot machines, the reels are 'fake'. Simply in that, you are seeing an animated simulation of real reels! Ultimately, in these games, a random number generator determines the nature of the finished spin. Typically you get to see 3 symbols per reel. So if you are playing a 5 reel game you would be able to see 15 symbols at any one time.
All slots games have a minimum of 3 reels while the vast majority of slots games nowadays have 5 reels. You can find a few games with 7 reels such as the WGS technology powered Farming Futures slot game (and we even have our own 7 reel slot game) and there are also games with 9 and 12 reels.
Next, up for how do slot machines work, we have the Paytable. Which is where you'll find all the key information about a slots machines payouts and rewards. At its very basic, such as on classic slots, a paytable simply provides an easy to understand table of winning symbol combinations. For example 3 cherries in a row with the winning credit amount next to it - very easy to understand.
As a slot machine become more complex, with more features and paylines, so inevitably does the paytable. But hopefully, the designers will have done their job properly. All the key information you need to understand the game will be available on easy to understand screens. In video slots machines you'll typically find a paytable screen that tells you about any special symbols. Such as scatters, wilds and multipliers, a screen that provides a detailed table of possible wins. Along with a screen that shows you all the possible paylines. For example, if you are playing a 25 payline game you will see 25 different colored grids.
It's important to have some basic knowledge of a slot machine game's unique paytable. Just so that you know what you're doing and also so that you can choose a slot game with the type of features you prefer. E.g. games with bonus rounds, free spins etc.
As a general rule, you should spin a slot machine in free play or demo mode. Check and get a quick overview of the game's paytable before investing real money on a slot. Although, we admit there are times when a slot machines theme or the discovery of a new slot machine tempts you to just 'dive in' with a few real wagers and the hope that you'll be lucky!
Underneath the reels, you'll typically find all the key buttons you need to play your chosen slot machine. Recognizing and understanding these buttons is key to knowing how do slot machines work from a playability point of view. The buttons you'll find on slots tend to be:
1. The Spin Button: This needs no introduction! Pressing the spin button will kick off the action and set things in motion.
2. Paylines Button(s): You use the payline button(s) to determine how many paylines you wish to play. There will be either one payline button to let you cycle through the available possibilities or Plus and Minus buttons.
3. Coins or Bets Button(s): players use the Coins/Bets button to determine how many coins they wish to wager on the next spin.
4. Bet Max Button: This is a handy way to quickly bet the maximum number of counts and paylines. Be warned: the Bet Max button might save you time selecting paylines and coins, but repeated use of the Bet Max button is the quickest way to 'eat up' all your available credit.
5. Auto Spins button: Some games have an auto spin button which lets you play a game without even having to press the spin button.
You can set up your wager (coins * paylines) then set how many spins you want to automatically happen. Some slots players prefer to use the Auto Spins button and then sit back and watch what happens. While other players prefer to press the spin button each time themselves. Psychologists would probably have something interesting to say about each type of player!
On the British pub fruity style games. You'll also find Hold buttons which let you lock a reel in place for one or more subsequent spins. Also, Nudge buttons which let players shift symbols up or down the reels. So for example, a player might be able to shift a cherry symbol down two places to create a winning payline. You can see these buttons and features in our very own exclusive Fruit Machine games.
Slot Machine Payouts
Another important thing to know to understand how do slot machines work. Also, one reason that slot machines are incredibly popular, and can even be addictive. Is that the game developers/casinos have carefully calibrated their games. To ensure players experience some degree of good luck and success.

Slots machines have a payout rate which is typically set up between 82% to 98% of the money that is wagered by players. This is known as the 'theoretical payout percentage' or RTP, 'return to player'. The minimum theoretical payout percentage varies among gambling jurisdictions.
At first glance, a slot machine that claims to pay out 98% might sound too good to true. However, you should be aware that, as always, the house always has the edge and this 98% covers all wagers. Not just your wagers! Across the expected lifespan of a machine. The casinos operate their machines on the theory that each machine will make only a small profit from most players. But because the numbers of players can be huge (over a decade, for example). The profits per machine can really stack up.
Obviously online virtual slots machines mean casinos in effect have an infinite number of slots taking up no floor space. Also, only require tiny amounts of data storage on a server. There is no longer the problem of slots machines breaking down and needing repair/replacing. Online casino operators don't even need to employ someone to clean them or empty the coins out of the machines!
Overall then, you shouldn't see a claim that a game has a payout rate of, say, 98% as a guarantee that you will win 98% of the spins that you play. If you only have money for four spins. It is quite possible and highly likely for you to spin all four times without winning.
Slot Machine Myths
It's easy to find so-called experts who are convinced they know all there is to know about slots machines and how to beat them. Also including how do slot machines work. But the truth is, slots machines are simply a game of chance. They should always be viewed as games of fun in which you might just get lucky one day. Approaching a slot with the conviction you're definitely going to win. Or with the belief that you're an expert player with the brains to beat the system. Isn't actually going to tip the odds in your favor!
Of course, slots machines do actually pay out. Many players have been lucky to win life-changing sums of cash. By triggering progressive jackpots or hitting rare features. Such as getting huge numbers of free spins. However, don't forget that these lucky players are the exception!
When Appeared The First Slot Machines Come Out Come Out
Slots machines are bound by law to pay out. If a slot machine never paid out it'd be a con. The developers of slots will let you know how much a slot machine pays out.
When Appeared The First Slot Machines Come Out Now
Ultimately you must never forget that all legal and genuine slot machine games are built around true Random Number Generators. - there are no patterns nor favorable or unfavorable times to play. Although if you're thinking of playing progressive jackpots. It makes sense to look for a game with a big jackpot that has been building for months.
Now you're fully up to speed with slots and know the answer to the question How Do Slot Machines Work. Why not check out our very own selection of slots machines, and get spinning? We've got every base covered with multi-payline slots, 3 reel slots, 3D slots, bonus slots, Mobile slots machines, and many more free slots machines.An exclusive and expanding collection of slots that you won't find anywhere else and all free to play too!