How Slot Machines Work


Slot machines have been around since the 19th century and have been evolving over time. While they used to be made entirely of strings or gears, today’s slot machines have electronic touchscreen displays and flashy lights. But they still reveal symbols in random order based on a computer program. What’s more, they often come with bonus rounds.

Payback percentage

Many casinos promote the payback percentage of their slot machines to attract players. However, this percentage does not necessarily reflect the true odds of winning. The payback percentage of slot machines varies depending on the skill level of the player and the amount of experience he or she has. In addition, the payback percentage of a slot machine will be less than 94 percent if it pays out less than 25 cents for every dollar wagered.


Several different symbols are used in slot games. Some of these symbols trigger bonus games and others do not. Regardless of which symbols you encounter, it’s important to read the pay table and understand how they work.

Symbols in bonus rounds

In online slot games, bonus symbols are symbols that trigger additional bonus features. These symbols can be either wild or scatter. They may also act as both. Bonus symbols can activate Free Spins or Bonus Games and can even increase payouts.

Weight of coins in hopper

The coin weight in a slot machine is determined through a process known as hopper calibration. This process involves periodically weighing the coin hopper and automatically determining the per-coin weight. This weight is then used to determine the number of coins in the hopper, and to compare that number to the authorized difference. This difference is used to determine whether coins are being removed from the hopper without the user’s permission.

Tiered loyalty schemes

Tiered loyalty schemes for slot machines can help drive customer loyalty. As customers spend more money, they will get more rewards, such as higher deposit bonuses. Members of higher tiers may even receive faster support service. The idea is to keep customers engaged and interested, but not entice them to switch to a competitor’s loyalty scheme.