Roulette

Roulette is a casino game, in which players may choose to place bets on either a single number or a range of numbers, the colors red or black, or whether the number is odd or even. In Fallout: New Vegas, winning 10 spins of roulette gives you the Little Wheel achievement/trophy.

Appearances
Roulette can be played in Fallout, Fallout 2 and Fallout: New Vegas. In the first two games, it's played simply through dialogue, while in New Vegas, it's featured as a minigame.