Slot machines have been popular since their invention. With the advent of the internet, they have multiplied and, in some cases, become almost unrecognizable. Today, there is something for everyone, with every possible theme, and their success continues unabated. In fact, as the years go by, they continue to attract more and more new fans.
Want to know everything there is to know about the world of online slot machines? In this comprehensive guide, we will first discuss the history of these games. Next, we will explore their features and functionality, as well as some particularly popular themes and developers. Finally, we will cover topics such as RTP, risk levels, and mobile versions of online slot machines.
How Do Slot Machines Work?
Today, online slot machines remain among the most popular games in the world. There is a wide variety available on the internet, but they work in much the same way as the original Liberty Bell machine and its successors. In online slots, an algorithm simulates the randomness of the spinning reels. This algorithm generates numbers randomly, so regardless of the player or the moment they play, the theoretical chance of winning the jackpot remains the same.
Before you get started and aim to become skilled at online slot machines, it’s helpful to understand how they work. To make things easier, we’ll go over the different components of a slot machine. Keep in mind that these components are generally the same on both ‘old school’ machines and online slots. If you want to practice without risking your own money, you can even try a Wanted Win promo code, which lets you play and explore the games for free.
The Reels
Slot machines usually have between three and six reels. Their purpose is simple: once the player activates the slot, the reels display different symbols. Symbols can be classic (colours like those of a card game, fruit logos, etc.) or themed to match the slot’s storyline. Technically, the possibilities for symbols are endless.
The Rows
The more rows a slot machine has, the greater the chances of winning. Along with the reels, the rows are a core element of every slot machine.
Paylines
On older machines, there was only one payline, located in the middle. Today, many online slots offer multiple paylines, and sometimes players can choose them themselves. This allows for strategy and can reduce the role of pure chance.
Free Spins
Free spins are exactly that—spins you don’t pay for. During these spins, you cannot lose, and the chances of winning can even be multiplied. This feature is very popular with slot players. Be prepared for an adrenaline rush when a free spin is triggered!
The Paytable
The paytable (or payout table) shows players how many free spins they have, the maximum potential win, special symbols, winning combinations, RTP (explained in detail below), and other relevant information.
Bets
On a slot machine, the more you bet, the higher your potential winnings.
Slot Machine Themes
Today, the variety of themes available on online slot machines can be dizzying. This is hardly surprising, as most players prefer machines with themes that appeal to them. Some players are drawn to animal themes, others to exotic destinations, sports, popular culture, and more.
Among the most popular themes are Cleopatra slots. The ancient Egyptian queen attracts players not only because of her legendary charm but also because many games featuring her offer a host of bonuses, multipliers, and free spins.
Magic-themed games are also very popular. And why wouldn’t they be? Many people remain fascinated by magicians long after childhood. Here, spells, powers, and even rabbits pulled out of hats are all part of the game.
Slots inspired by Las Vegas are as numerous as they are popular. As the world’s most famous casino city, it provides endless inspiration. Many online developers offer slot machine models based on the glamour and excitement of Las Vegas.
If you enjoy films, TV series, or comic books, you are sure to find something that suits your tastes in the world of online slots. Whether you are a fan of the cyborgs in Terminator, the gangsters in Scarface, or the resurrected dinosaurs in Jurassic Park, you can find a game that immerses you in the world of your favourite film.
Features and Functionality
Online slot machines vary widely, offering players an increasingly diverse range of worlds to explore. However, most share certain core features and functions. Here is an overview:
Wild Symbols
One of the most common bonuses, wild symbols usually appear to replace other symbols, giving players a better chance to win. There are many types:
- Expanding wilds cover other symbols.
- Shifting wilds move to different positions on the screen and can be used for several spins in a row.
- Sticky wilds are shifting wilds that remain in place.
Scatter Symbols
Scatter symbols are another popular bonus. They can trigger a win on their own, without forming a traditional winning combination.
Multiplier Symbols
Multipliers are highly sought after by players, as they multiply winnings according to specific combinations.
Free Spins
As the name suggests, free spins allow players to spin the reels without betting.
Respin
This feature allows players to spin again if they narrowly miss a win.
Progressive Jackpot
A progressive jackpot grows in value with each bet, giving players the chance to win larger prizes.
Avalanche Mode
Instead of spinning after a win, the winning symbols disappear and are replaced by new symbols, increasing the chances of consecutive wins.
Bonus Games
Bonus games are becoming increasingly popular in modern slot machines. Here, players can engage in extra gameplay that often comes with additional rewards.
Slot Machine Developers
But who is behind the online slot machines? It’s impossible to answer in one sentence, as there are so many developers. Some players don’t pay much attention to this, but many end up having a favourite. They tend to favour that developer’s machines because the universe or features match their expectations.
Is it important to know the developers when playing slots? Yes, it can be an advantage. Some developers offer more flexible RTPs than others, while some specialize in slots with stunning or extravagant graphics. Others focus on retro themes that take players back several decades.
It is impossible to name all developers, but here are three of the best-known, all offering free games that do not require downloading:
Net Entertainment (NetEnt)
A Swedish developer specializing in slots since 1996, NetEnt has won numerous awards. Its slot machines immerse players in a variety of worlds, from vampires (Dracula) to hard rock (Guns N’ Roses), the Wild West (Dead or Alive), and fairy tales (Little Red Riding Hood).
Play’n GO
Best known for mobile-friendly games, Play’n GO has been creating games since 2004 with a wide range of themes. Players can find slots inspired by Vikings and Scandinavian mythology (Viking Runecraft), marine adventures (Eye of the Kraken), and Indian legends (Pearls of India).
Microgaming
Active since 1994, Microgaming is perhaps the best-known online slot developer. The company has created more than 850 games, including 350 mobile-friendly slots and 300 that can be played for free without downloading. Themes range widely, from Game of Thrones to Tarzan and Jurassic World.
Return Rate: What is RTP?
RTP stands for ‘Return to Player’. Anyone who has spent time on online casino sites or forums will be familiar with this term. However, RTP still causes confusion for many. When enjoying slot machines, it’s important to understand what RTP really means. Too often, people confuse it with luck, but that is not the case.
Simply put, RTP measures the relationship between the money wagered by all players on a machine and the money that the machine redistributes to them. Keep in mind that RTP is only an average. A player may have less luck on a machine with a high RTP than on one with a lower RTP.
Let’s imagine a machine with an RTP of 90%. What happens if you bet £100 on it? An RTP of 90% does not mean you will necessarily win £90, nor does it mean your chances of winning are 90%. It simply means that, over a period of time, the machine has returned £90 to all players collectively from every £100 wagered.
In other words, the RTP, or ‘return rate’, depends on the amount the machine redistributes to players at any given time. Over a certain period, it is possible for a machine to have an RTP of over 100% if several players in a row are unlucky while betting big. Conversely, if one player wins big, the following players may experience a lower RTP. This brings us to the concept of slot machine risk levels.
Slot Machine Risk Levels
Also known as variance, risk levels are another key concept in understanding how slot machines work. Risk levels are simple and logical, and it’s helpful to know about them before you start playing.
On a slot machine, the amounts you can win vary greatly due to the many possible symbol combinations. This is why a machine’s risk level cannot be expressed as a single number, unlike roulette, which has far fewer winning combinations.
Most developers classify slot machines into three categories: low, medium, or high risk. Higher-risk slots can pay out bigger prizes, but lower-risk slots are less likely to result in losses.
To illustrate, consider the lottery. Participating in games like the Lotto usually has an RTP of around 50%, a low return rate. However, the volatility is very high, with the chance of winning millions, which continues to attract many players.
Along with lotteries, slot machines are among the most variable games. Depending on your preferences, this can be either a minor inconvenience or a real advantage.
Playing Slot Machines on Mobile Devices
More developers are offering smartphone versions of their slots, and this is a positive development. Playing on the subway, in the street, or in a waiting room is becoming normal. Touchscreens make mobile slots even easier to use, enhancing the experience.
Mobile versions often differ from desktop versions. Many have been redesigned and include bonuses or features only available on mobile devices.
Some casinos even encourage players to switch to mobile versions through exclusive promotions and rewards. Referral systems may offer bonuses if you recommend the mobile slot to a friend who registers. Many players believe that mobile will become the primary platform for slots in the future.
The History of Slot Machines
The virtual slot machine is the descendant of the classic mechanical or electronic slot. The first mechanical slot appeared in 1898, created by Californian Charles August Fey, who had been interested in automatic roulette machines since his youth. He named his first machine Card Bell and his second, launched in 1899, Liberty Bell.
The Liberty Bell machine had reels decorated with card symbols—hearts, diamonds, spades—plus a bell and a horseshoe. Winning required lining up three bells in a row. The Liberty Bell was an instant success, but Fey did not file a patent, leaving the door open for other companies. Mills and Caille launched their own machines inspired by Fey’s design. During Prohibition, Mills cleverly replaced gambling symbols with candy, giving rise to the fruit-themed machines still familiar today.
Electronic slots appeared in the 1980s, gradually replacing mechanical machines. Some used video systems, and others offered multiple mini-games. By the late 1990s, the first online slot machines emerged. Online slots quickly became hugely popular, with developers competing for originality. Some drew on popular culture (Tomb Raider, Spiderman), while others were inspired by role-playing games and other genres.