What are Random Number Generators?

Random number generators (RNG) are a mechanism that allows slot games and other virtual casino games to have truly random and independent game rounds. With online slot machines, this is handled by an algorithm that is created by a 3rd party in order to maintain integrity.

Online casinos are checked by their licensors to ensure that all of their games are verified as fair. Proper RNG ensures that games are not rigged against the player and that new game rounds remain independent from previous ones.

How do random number generators work?

You may be asking yourself, how do random number generators work? Well, it essentially comes down to complex mathematical equations that create a fixed algorithm for generating pseudorandom numbers. Seed values create an input for the algorithm, creating an added layer of randomness. This means that the constant generation of numbers has different starting points. A sequence of numbers will be tied to a game outcome, meaning that new outcomes are constantly being generated, and it is only when you press spin that the last randomly generated sequence of numbers is selected and mapped to the game screen.

Slot games and RNG

So, how does this work when it comes to slot games? Different slots have different return-to-player (RTP) percentages. As slot RNG is based on pseudorandom numbers, these can be manipulated to create probable outcomes on average and over an extended period. A slot game with a higher RTP may have its number generators mapped to more favourable game rounds more often than one with a lower RTP, for instance.

This allows game providers to ensure that a specific slot game has an RTP of 97%, for example. An RTP of 97% would mean that, on average, a player will receive back 97% of what they initially wagered over an extended period of game time. It is important to keep in mind that casino games are required to be regularly checked to ensure the integrity of their random number generators.

Random number generator FAQ

Here is a quick FAQ to dispel some myths about random number generators and how they affect slots and casino games. 

Are hot and cold rounds real?

Hot and cold rounds are a perception created by our need to find patterns, even in randomness. The RNG ensures that each round is independent of the last. It is easy to associate a winning streak with the temperament of the game, but ultimately, it is controlled by a single-minded algorithm. There is, therefore, no perfect strategy on how to play against a random number generator.

Does RNG affect bonus rounds?

Triggering a bonus round will come down to the RNG as well as the slot’s game mechanics. The game mechanics affect what triggers a bonus round, while the RNG controls the possibility of a trigger happening.

Can RNG be changed?

Some slot games have a range of RTPs that can go up or down depending on how much you bet, for example. A change in the RTP will affect the RNG. However, there is no way for you or the game providers to manipulate the RNG directly. The RNG is a fixed algorithm maintained by a 3rd party.

How do I know that a slot is fair?

Any online casino that operates under a regulated gambling licence must be able to prove its games are fair. Licensed casinos are regularly audited for fairness, amongst other things. The best way to ensure the site and its games are fair is by checking to see if it operates under a respected gambling body, such as the UK Gambling Commission or the Malta Gaming Authority.