The payout structure is set by the casino, & different combinations result in different payout amounts. Modern video slots, on the other hand, use Random Number Generators (RNGs) topin-up - casino and slots decide the results. Generating random numbers and contemporary video slots. Thousands of random numbers are produced every second by a sophisticated algorithm known as an RNG, which guarantees that every spin is distinct and unpredictable. Upon pressing the spin button, the RNG chooses a number that matches a particular set of symbols displayed on the screen.