Playing 10 spins of Roulette gives you the Little Wheel achievement/trophy. 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.
There is a Roulette table in the Stockmen's Association Headquarters in NCR Downtown. Roulette can be played via dialogue in Fallout and Fallout 2 by speaking to Roulette dealers in the following locations.