Modern casino slot machines are controlled by computer software, and the win percentages are preprogrammed into the software.
Casino Slots have Random Number Generators that are eternally generating combos, even when the slot machine game is not currently being played.
Running in sync with the random # generator of the casino slot machine game is the payout percentage.
The pay out percentage controls just how much the slot machine will payout, for e.g. the pay percent could be ninety per cent, which means the slot machine game will pay out ninety per cent of all the stakes played, and the casino simply 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 is the fun … exhilaration in that? Instead, the casino slot will not pay out for a little while, and then suddenly start up a hot streak and you might catch the big jackpot prize.
The pay off %s will vary between the alternate games and just a few of the extremely established casinos, for instance Golden Online Casino, which gives a pay out of up to ninety five per cent!
Hence, in essence, the slot machine takes all the cash played into it and pays it out to several lucky winners. The casino only gets to keep a averagely small % of all the bets allotted.
The casino slot software controls every single part of the machine, from the flashing lights to the turning of the reels.
When you hit spin on the slot machine, a combination is formed by the RNG which associates with the pictures on the reel.