Modern casino slot machines are controlled by a computer, and the win %s are pre-programmed into the computer software.
Casino Slots have Random # Generators which are endlessly generating combinations, even when the slot machine game is not active.
Running collectively with the RNG of the casino one-armed bandit is the payout %.
The payout % controls just how much the one-armed bandit will pay, for example the payout percentage could be ninety percent, meaning the slot game will payout ninety percent of all the bets played, and the casino will then get to keep ten percent.
This is not to say that each time you bet 10 credits you will receive 9 in return – where is the fun … excitement in that? Instead, the casino one arm bandit just will not payout for a while, and then suddenly start up a hot streak and you might hit a big pot prize.
The pay off %s most likely will vary between the differing games and a couple of the very popular casinos, for e.g Golden Online Casino, which tenders a payment of up to 95 %!
So, in essence, the slot machine game takes all the funds played into it and pays it out to several lucky winners. The casino only gets to keep a considerably small percentage of all the wagers allocated.
The casino slot software controls every part of the machine, from the dazzling lights to the rolling of the reels.
When you hit spin on the slot machine game, a combination is put together by the RNG which is linked to the pictures on the reel.