10 Facts about Slot Machines


Slot machines, often referred to as one-armed bandits, have been a staple of casinos for over a century – and it’s not hard to see why. These devices, which combine elements of chance and technology, have a fascinating history and a significant impact on the gaming industry. Here are the top 10 facts about slot machines – from their origins and their symbols to their presence in the online casino.

The Origins Of Slot Machines

The first slot machine, known as the Liberty Bell, was invented in San Francisco in 1895 by Charles Fey. This mechanical device featured three spinning reels and five symbols – horseshoes, diamonds, spades, hearts, and the Liberty Bell.

Fruit Symbols And The Bar Icon

In the early 20th century, slot machines started using fruit symbols like cherries, lemons, and plums. The iconic BAR symbol originated from the Bell-Fruit Gum Company’s logo, which used to represent different flavors of chewing gum. Since then, these fruit symbols have become an iconic part of Slots today.

Technological Evolution

From mechanical reels to digital screens, slot machines have undergone significant technological advancements. The first fully electronic slot machine was introduced by Bally in 1963, Money Honey. This innovation paved the way for the video slot machines that dominate many casinos today.

Random Number Generators (Rng)

Modern slot machines, including those online, now use Random Number Generators (RNGs) to determine the outcome of each spin. This technology is designed to ensure that each spin is completely random and independent of any other spins.


This makes it impossible to predict or influence results, so games are kept fair and entirely chance-based. RNGs are crucial for maintaining the integrity and fairness of the game.

Slots In Different Countries

As of most recent statistics, Japan is said to have more Slots than any other country in the world. Slot games are highly popular there, and it’s estimated that they’ve got over 4 million slot machines spread all over the country. These are situated in well-known casinos and plenty of other spots.

Progressive Jackpots

Some slot machines feature additional styles of gameplay, such as progressive jackpots which grow over time as players make bets. A portion of each wager contributes to the overall jackpot, which can continue to grow until a matching combination is found. Progressive jackpots can be linked across multiple machines and even multiple casinos.

Online Casino

With the advent of the internet, slot machines made their way to online casinos. Online Slots offer the same types of games you’d find in physical casinos but even more. You’ll have access to a variety of themes, features, and more, which can all be played from anywhere a player has a reliable internet connection.

There Are No “Hot Or Cold Streaks”

It’s a common misbelief that slot machines can be “hot” or “cold”, meaning they’re more likely to see matching combinations according to how recently it last saw them. However, this is not the case, and as you’ll know from RNGs, every slot spin is completely independent of previous spins.

Return To Player (Rtp) Percentage

In online slot games, the Return to Player (RTP) percentage is a numerical expression representing the average amount of wagered money that a slot game returns to players over time. It’s crucial that this is not interpreted as a guide to how likely you are to succeed.


As mentioned, there is never a guarantee or way to predict the outcome of a spin, so the RTP percentage is merely an insight into the game.

Regulation And Legality

On top of RNGs, slot machines are heavily regulated to ensure fair play and player protection. Regulatory bodies oversee the licensing, operation, and auditing of slot machines. This applies not only to casino slots but also to online casino slots. So, as long as you play with a licensed provider, you can expect fair and safe gameplay.

Slot machines have come a long way since the invention of the Liberty Bell, and these top 10 facts are just a few of the many interesting things about Slots. What else have you learned about them?