Modern casino slot games are controlled by a computer, and the win %s are preprogrammed into the game software.
Casino slot machines have RNGs which are ceaselessly generating combinations, even when the machine is not being played.
Running in unison with the RNG of the casino slot machine is the payout percent.
The payout percentage controls how much the slot machine will payout, for e.g. the payout percentage could be ninety per cent, meaning the slot machine game will payout ninety percent of all the bets played, … the casino simply gets to keep 10%.
This does not mean that each and every time you bet 10 credits you will receive nine in return – where’s the fun and fascination in that? Instead, the casino slot machine just will not pay out for a bit, and then suddenly start up a hot streak and you might catch the big jackpot prize.
The pay off percentages most likely will vary between the various games and a couple of the extremely popular casinos, e.g. Golden Online Casino, which puts forth a payout rate of up to 95 per cent!
So, in essence, the slot machine takes all the currency played into it and pays it out to several lucky winners. The casino only gets to keep a averagely small percentage of all the bets allocated.
The casino slot machine software controls every single part of the machine, from the blinking lights to the revolving of the reels.
When you hit spin on the slot machine, a combination is produced by the RNG which associates with the pictures on the reel.