What Are the Different Types of Slots?


A slot, also known as a fruit machine or reel machine, is a type of gambling machine where players insert coins to try and win money. They are usually found in casinos and can be played for free or for real money. There are many different types of slots, and it is important to understand what makes a good game before you play for real money.


A casino or slot game that has a high variance means that players have to spin the reels for longer to get a winning combination. This can cause a player to lose money for a long time before they get a big win. In contrast, a low variance slot game has less volatile payouts. To determine whether a game has a low or high variance, you can play a free slot machine and record your results.

Payout percentage

A game’s payout percentage is the amount of money it will pay out to players with respect to the total amount they wager. It is a key factor in determining the odds of success, and it is typically listed on the pay table.

This number is calculated by subtracting the amount of times a specific symbol appears on the reels from the total number of combinations that appear on the machine. This is done to ensure that players have a fair chance of winning, and the number is often accompanied by a graphics overlay to show the probability of a particular symbol appearing.

Bonus Mode

Slot machines are often set up in a ‘bonus mode’, which allows players to win extra money by making specific combinations of symbols. These bonuses can be as simple as a single coin payout, or as complex as a sequence of symbols that pays out a fixed number of coins or more per line. These bonuses can also trigger a variety of other features, such as special scenes on the screen or energizing music that plays.

Random number generators

A slot machine uses a computer to generate random numbers, which are used to decide whether the machine wins or loses. These random numbers are determined by an algorithm, which is based on a large number of possible combinations.

These algorithms are based on principles like the laws of probability and statistics, and are subject to constant scrutiny by gaming authorities. They are not intended to cheat, and they must be accurate in their representation of the original game.


A tilt is a technical fault that can cause an electromechanical slot machine to stop paying out or fail to function correctly. It can be caused by a defective door switch or an electrical problem with the reel motor.

The most common tilts are broken locks and out of paper, but others can be caused by a faulty reel motor or a damaged button. Tilts are a serious matter that should be reported to a slot attendant or the casino floor manager as soon as possible.