Modern casino slot machine games are controlled by computer chips and software, and the win %s are pre-programmed into the software.
Casino slot games have RNGs that are eternally generating combinations, even when the machine is not being played.
Running simultaneously with the RNG of the casino slot machine is the payout per cent.
The pay out per cent controls how much the slot machine will pay out, for e.g. the pay percentage could be 90%, meaning the one arm bandit will payout 90% of all the stakes played, and the casino will then get to keep ten per cent.
This really does not mean that each and every time you bet ten credits you will receive 9 in return – where’s the fun … thrill in that? Instead, the casino slot machine just will not payout for a while, and then suddenly fire up a hot streak and you might draw the big top prize.
The pay out percentages will most likely vary between the various games and several of the most popular casinos, such as Golden Online Casino, which offers a payout of up to 95 per cent!
Thus, in essence, the slot machine game takes all the $$$$$ played into it and pays it out to some lucky winners. The casino only gets to keep a relatively minute per cent of all the bets placed.
The casino one armed bandit software controls each and every part of the machine, from the flashing lights to the rolling of the reels.
When you hit spin on the slot machine, a combination is generated by the RNG which corresponds to the pictures on the reel.