Modern casino slot games are controlled by computer software, and the win %s are pre-programmed into the game software.
Casino slot machine games have Random Number Generators which are endlessly generating combinations, even when the slot machine is not currently being played.
Running simultaneously with the Random Number Generator of the casino slot machine is the pay out percentage.
The pay out percent controls how much the one-armed bandit will payout, for example the pay out % might be 90%, meaning the slot machine will payout ninety per cent of all the bets played, … the casino only gets to keep ten percent.
This is not to say that for every time you bet ten credits you will receive nine in return – where is the fun and fascination in that? Instead, the casino slot machine game won’t pay out for a while, and then suddenly fire up a hot streak and you might catch the big jackpot.
The payoff percentages shall vary between the various games and several of the very acclaimed casinos, for instance Golden Online Casino, which puts forth a pay out of up to ninety five percentage!
Thus, in essence, the slot machine takes all the currency played into it and pays it out to several chosen winners. The casino only gets to keep a averagely low percentage of all the wagers made.
The casino one armed bandit software controls every part of the machine, from the blinking lights to the circulating of the reels.
When you hit spin on the slot machine, a combination is developed by the RNG which is linked to the pictures on the reel.