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Slot machines have been the staple of many casinos and gambling establishments for more than a century. Over that time, they have provided a huge chunk of revenue for their owners, sometimes reaching 70% of the entire casino’s income. Over time, various types of slots have been developed and each had a loyal following. From simple poker machines and Liberty Bells of the 19th century to modern online slots, they have always attracted players from all over the world.

The History

The first slot machine was designed in 1891 by Sittman and Pitt, a Brooklyn-based company. It contained five reels with 10 symbols each. The symbols were based on poker cards, as well as the winning hands. For a nickel, players would play a spin, hoping for a winning poker combination. Since the machines didn’t have a direct payment mechanism, the prizes were given out by the bar owners, where most of the machines were located. For a simple pair, you could get a free beer. A royal flush would get you dinner and drinks. Each establishment offered prizes based on what they could offer. The popularity of these first slots was so great that there was hardly a bar in New York that didn’t operate at least one of them.

The number of combinations was so big that it was almost impossible to devise a machine that could handle direct payments. Realizing the problem, Charles Fey of San Francisco came up with a much simpler design in 1895. Fey’s machine had only three reels, each with five symbols. Many modern manufacturers still use these slot machine symbols, although fruit symbols are also widely popular. They were horseshoes, diamonds, spades, hearts, and a Liberty Bell, for which the machines were named. The ease of use created massive popularity and even after they were banned in California a few years later, Fey had trouble meeting the demand.

More about slot machine symbols you can find here: https://www.askgamblers.com/gambling-news/blog/slot-machine-symbols/ .

Traditional Slot Machines

For a long time, traditional slots based on Fey’s design were the only type available to the players. It is hard to imagine any famous Las Vegas casino without rows of them lining its halls. Even the Las Vegas Airport, the McCarran International, has hundreds of slots installed in their passenger areas. While the design of mechanical slots evolved over time, the basic principle remained the same. In the 1960s, the first electromechanical slots appeared. However, it wasn’t until 1976 that the first major change was introduced. The development of electronics has allowed the designers to create the first video slot, called Fortune Coin. It featured a 19-inch Sony display, originally used on a TV model. As soon as it was approved by the Nevada State Gaming Commission, hundreds of them were made for casinos on the Las Vegas Strip.

Online Slot Machines

The One-hand Bandit, as traditional slot machines came to be known, due to their distinctive lever, dominated the market for decades. Then came the age of the Internet. Online slot machines were made possible by the development of original video slots. It was only a matter of time before the developers saw the potential computers offered and started integrating them into video slots. From there, it was only one step to abolish machines altogether and host them online. In 1996 the first online casino was opened, called Intercasino. Among other games, it featured several online slots that prove to be as popular as their physical cousins. The differences between online and traditional slot machines weren’t that drastic, allowing players to easily transition from one type to another. Those first slots were a far cry from the modern ones we have today, but still, players flock to them. Over time, various types of online slots were developed.

Progressive Slots

The main difference between progressive and traditional slots is the jackpot. Traditional slots have a fixed amount they will pay out to the lucky winner. Progressive ones, on the other hand, have a changing jackpot which increases with every spin. Each time a bet is placed, a percentage of it goes to the jackpot fund. The percentage varies from one slot to another, with some setting aside as much as 15% for the jackpot. This way, it is possible to reach truly astounding figures, provided nobody has won it for a long time. Progressive slots come in three flavors. Standalone variety only calculates its own bets for the jackpot and provides the smallest winnings. The second type is in-house slots, meaning all slots in one casino are linked together. Finally, there are wide-area slots, which create a huge network of slots all contribute to a single, massive jackpot.

Multiplier Online Slots

Multiplier slots got their name from their ability to multiply your winnings. Depending on the machine, that multiplier can be x2, x3, or even x100. After you have got a winning combination, you will be offered a chance to increase it in a bonus round. Sometimes the prizes are small, like free spins, but they can also be quite valuable. The possibility to double or triple your initial winning is a temptation not many players can resist, but keep in mind that you can also lose the bonus round and your prize with it.

Video Slots

As we mentioned, the original video slots appeared in the 1970s. since then, they have evolved tremendously, keeping in step with the development of their core technology, the graphic display. Today, modern video slots have graphics that rival those of the most demanding video games, offering their players a rich experience.

For the better part of the last century, slot machines were simple enough. They consisted of a metal box that housed spinning, mechanical reels with symbols on each reel. If the symbols lined up and matched, then the player won a jackpot.

Over the last three decades, computer and video game technology have caused big changes in how slot machines are played. Gamblers still see spinning reels, but the mechanism is now powered by a microcomputer called a random number generator.

Additional features have become commonplace, and dozens of different types of slot machines have become available. This page lists and categorizes the major types of slot machines available in casinos throughout the world.

Bonus Slots

One of the most common types of slots games now available are bonus slots, which offer bonus games when certain symbols or combinations of symbols appear on the payline. One of the most popular examples of this type of game is the ubiquitous Wheel of Fortune slot machine game, which features a replica of the wheel from the eponymous game show above the machine. When you hit certain symbols, you get to spin the wheel and get a bonus payout.

Banking Games

A banking game is a game in which coins are accumulated until they’re won. Piggy Bankin’ is one of the most popular examples of this kind of game, which has been around for a long time. Banking games should not be confused with progressive slots, which are covered later on this page.

Multiple Reels and Paylines

Early slot machines featured three reels and a single payline, but modern slot machines have a lot more possibilities. Why is this? Computers.

Three reel slot machines often now have multiple paylines, and five reel slot machines have an even greater number of paylines.

These changes have increased the potential size of the jackpots available on these games. It’s not hard to understand the math of why this is possible. If you have three reels with ten symbols on each, the hardest combination to hit has a 1 in 1000 chance of hitting. Any jackpot larger than 1000 to 1 would result in a loss for the casino.

Compare that with a five reel game with 256 different symbols on each reel. This kind of machine would be impossibly large if the reels were actual metal strips, but computers use imaginary reels, with results determined by a random number generator inside. With these kinds of odds, astronomical jackpot amounts can be offered, and the machine will remain profitable.

The number of paylines has increased dramatically, too. Early slot machines had a single payline, but now, common slot machine games offer the following numbers of paylines:

• 2
• 3
• 5
• 9
• 20
• 25

A new type of Australian slot machine game does away with paylines altogether, and these games offer 243 different ways to win. Basically, any combination of winning symbols from left to right results in payouts. These games are hugely popular, and even though the concept sounds a little confusing, it actually become intuitive very quickly during gameplay. In fact, 243 ways slots are wicked addictive fun.

Types of Progressive Slots – Standalone, Local, and Wide Area

Progressive slot machines offer constantly growing jackpots. These jackpots begin with a seed amount from the casino or network, and as each player plays, a tiny percentage of her bet is added to the progressive jackpot.

These jackpost can become astronomically high. The odds of actually winning such a jackpot are also astronomical. These types of games are comparable to the lottery.

Multiple versions of progressive slots are available. For example, a standalone progressive jackpot has a jackpot that’s tied to an individual machine. These types of progressive jackpots are generally in the $1000s of dollars range, and only play from that specific game count toward the progressive. In fact, standalone progressives are similar to banking slot machines.

Local progressive jackpots, on the other hand, feature linked jackpots within a single casino. These jackpots can grow larger faster because every bet on every machine in the network counts toward the growing jackpot. It’s not uncommon for these jackpots to reach into the $10,000s and even the $100,000s at larger casinos.

Picture Of A Slot Machine

But the big jackpots are the wide area progressive games. These games link together slot machines from multiple casinos, and their jackpots are life-changing. These are the jackpots which get into the millions of dollars.

The most popular wide area progressive network in the world is called Megabucks, which was launched in 1986 by IGT, the largest and most successful slot machine manufacturer in the world.

Types of Online Slots

The Kingdom Type A Slot Machine Free Play

All of the above types of slot machines are available in online versions as well as traditional brick and mortar casinos. In fact, in jurisdictions where online gambling is legal but regulated, you can find exact duplicates of the games available at Vegas casinos.

Most of these games are made available via Wagerworks, which was purchased by IGT in 2005 for $90 million. Examples of these branded and popular slots games now available online include:

• Elvis
• Family Guy
• Jeopardy
• Judge Judy
• Lobstermania
• Star Trek
• Wheel of Fortune

The Kingdom Type A Slot Machine Gun

Other online slot machine games are exclusively available online. Examples of these include games from Realtime Gaming and Microgaming, the latter of which offers some of the largest progressive jackpots on the Internet.