Though the rules of slot machines have changed very little in recent times, perhaps few people realize that Charles Fey invented the slot gacor machine in 1895. The main distinction between the slot of the first of 900 and those that exist today, virtual and physical, is to be found in the electronic system at the heart of the operation. For the rest, now play as it once was:

The player operates a lever that activates the wheels on the screen to spin around themselves. The wheels are designed symbols and images which will determine the outcome of the roll.

In the event the wheels stop, a series of images appears in the center line (line payment or "pay line" in English) of the game screen. If the wheels have stopped on the same image, completing the pay line, the player or even the player has won a payout calculated on the series of numbers which have appeared in the online payment.