Modern casino slot machine games are controlled by a computer, and the win percentages are pre-programmed into the game software.
Casino slot games have Random Number Generators that are ceaselessly generating combinations, even when the game is not currently being played.
Running simultaneously with the Random Number Generator of the casino slot machine game is the pay out %.
The pay out % controls just how much the slot machine will payout, for example the payout percent may be ninety percent, meaning the one arm bandit will payout 90% of all the wagers played, … the casino gets to keep ten per cent.
This doesn’t mean that every time you bet ten credits you will receive 9 in return – where’s the fun and fascination in that? Instead, the casino one arm bandit won’t pay out for a while, and then suddenly fire up a hot streak and you might hit a big top prize.
The profit percentages will most likely vary between the various games and some of the very common casinos, e.g. Golden Online Casino, which hands out a payment of up to 95 percent!
Thus, in essence, the one-armed bandit takes all the cash played into it and pays it out to several fortunate winners. The casino only gets to keep a basically small % of all the plays allotted.
The casino slot software controls each and every part of the machine, from the flickering lights to the revolving of the reels.
When you hit spin on the slot machine, a combination is developed by the RNG which associates with the pictures on the reel.