Modern casino slot games are controlled by computer software, and the winning percentages are pre-programmed into the game software.
Casino slot machines have RNGs which are endlessly generating combos, even when the slot machine game is not being played.
Running in sync with the random # generator of the casino one-armed bandit is the payout percentage.
The pay out percentage controls just how much the slot machine will pay, for e.g. the pay percent may be ninety percent, meaning the one arm bandit will pay 90% of all the stakes played, and the casino only gets to keep ten per cent.
This is not to say that each time you bet ten credits you will receive 9 in return – where’s the fun and excitement in that? Instead, the casino one arm bandit just won’t payout for a little while, and then suddenly fire up a hot streak and you might catch the big top prize.
The pay off %s will very likely vary between the differing games and some of the highly common casinos, for e.g Golden Online Casino, which tenders a pay out of up to 95 per cent!
This means that, in essence, the one-armed bandit takes all the $$$$$ played into it and pays it out to a handful of chosen winners. The casino only gets to keep a generally petite percentage of all the wagers made.
The casino slot machine software controls any part of the machine, from the flashing lights to the rotating of the reels.
When you hit spin on the slot machine game, a combination is generated by the RNG which relates to the pictures on the reel.