Even though the rules of slot machines have changed very little in the past, perhaps few people know that Charles Fey invented the slot machine in 1895. The main difference among the slot of the first of 900 and those that exist today, virtual and physical, is to be found within 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 relevant web site images which will determine the outcome of the roll.

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