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Modern casino slot machines are controlled by a computer, and the winner %s are pre-programmed into the software.

Casino slot machines have RNGs that are continually generating combos, even when the slot machine is not active.

Running in unison with the Random Number Generator of the casino slot machine is the payout rate percentage.

The pay out percent controls just how much the slot machine will payout, for e.g. the pay % might be ninety percent, which means the one arm bandit will pay out ninety percent of all the stakes played, … the casino only gets to keep 10 per cent.

This is not to say that every time you bet ten credits you will receive nine in return – where is the fun and thrill in that? Instead, the casino slot just won’t payout for a while, and then suddenly hit a hot streak and you might catch the big grand prize.

The pay out %s will vary between the different games and a handful of the very common casinos, like Golden Online Casino, which hands out a payout of up to 95 %!

Hence, in essence, the one-armed bandit takes all the currency played into it and pays it out to a few chosen winners. The casino only gets to keep a fairly low percentage of all the gambles placed.

The casino slot software controls every single part of the machine, from the flashing lights to the circulating of the reels.

When you hit spin on the slot machine game, a combination is generated by the RNG which associates with the pictures on the reel.