Roullete is a game of chance played on a table marked off in various sections affording the players a variety of bets, having in its center a revolving, dishlike device (roulette wheel) into which a small ball is dropped to rest finally in one of the compartments or pockets numbered from 1 to 36. Depending upon the section in which the ball stops and its characteristics, the winning number and the player’s wager are indicated.

The roulette wheel carries the numbers 1 to 36 and a single or double zero, depending on the type of the roulette game in question. The rim of the wheel has metal partitions called separators or frets, and these contain thirty-six colored compartments numbered nonconsecutively from red to black. A second green compartment on American-style wheels carries the number 0.

The European roulette version of the game is favored by many players at both physical casinos and online gambling sites since it has a lower house edge than its American counterpart. It also comes with the en prison and la partage rules which allow players to get back half of their even chip bets if they lose when the ball lands on zero.