The Ultimate Guide to Slot Machines: Strategies, Psychology, and Responsible Play A mainstay of casinos for many years, slot machines captivate players with their eye-catching lights, captivating sounds, & the adead or alive slotslluring prospect of winning a significant sum of money. Anyone hoping to have fun at the casino or even play online must have a basic understanding of how these machines operate. Slot machines are fundamentally games of chance, with each spin's result determined by a random number generator (RNG). The outcome is therefore completely random and unaffected by prior spins each time you pull the lever or press the button.