While some casino games have a skill element in the outcome, some casino games are purely based on chance. Because all online casino games are partly or completely driven by chance, all casino games count on a random number generator, or RNG within the software that powers the slots game. The RNG is a mathematical application that does precisely what it says: generates a completely random number. Not all RNGs are exactly the same, and they have to be tested extensively to make certain that the numbers they generate actually are random.

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