What Are the Different Types of Slot Machines?

Slots are often categorized according to their theme, which can be either aesthetic or character-based. These themes help drive the gameplay of the machine, as the symbols and bonus features are based on the theme. Some slots are themed after popular films and media franchises. In general, slot machines with a specific theme tend to be more fun to play.

Random number generator

A random number generator (RNG) is the most accurate way to ensure fairness in online casino games. This computer code generates a series of random numbers that cannot be predicted by a human, allowing players to make wagers based on probability. These devices are the safest and most secure way to ensure that the games are fair.

This device picks combinations of numbers thousands of times per second. A button is pressed to stop the electrical current, and light on the button represents the three-digit number picked by the RNG. It is important not to hesitate on the button, as this may result in a different result. You may even see someone else win the jackpot as a result of your hesitation.

Payback percentage

Slot machine payback percentage is a critical element of a successful slot machine. The higher the RTP, the better the slot machine’s chance of returning money to players. This percentage is measured by dividing the total amount of money wagered by the number of coins wagered. As the number of coins wagered rises, the RTP also increases.

The payback percentage of a slot machine is a calculation based on the average of all bets placed on that machine. Generally, machines with high payback percentages pay out more often. But the percentage can fluctuate and you should always check the payback percentage before you place your bet.


Slot machines often include optional minigames that players can play. These games allow players to place bets on different outcomes and can be more complicated than the main game. Some minigames are completely random, while others are based on skill. These can add to the overall enjoyment of the game.

Scatter symbols

Scatter symbols in slot machines are special symbols that award payouts when they appear on the reels. These symbols are often much bigger than regular icons, and they often relate to the theme of the game. For example, in the game Dragon’s Return, landing three or more egg-shaped scatter symbols will award you with free spins.

These symbols are most often used to trigger bonus games. You can win cash prizes by landing just one or two of these symbols on the reels, but it is important to note that these symbols work differently in different games. For example, some games only require two scatter symbols to trigger a bonus round. In other games, two or three scatter symbols can activate visual and audio clues that lead to the bonus round.

Progressive jackpots

A progressive jackpot on slot machines is a jackpot that grows with every bet made. These jackpots are generally larger than the regular jackpot and are connected to multiple machines. To know if a machine has a progressive jackpot, look for a small round number on the jackpot display. This jackpot is linked to several different casinos and state-based slot machines.

The biggest advantage of a progressive jackpot is that you can win a very large amount of money. However, the odds of winning a progressive jackpot are lower than those of a stand-alone machine, so it’s important to play with a budget and limit your bets.