Roulette is a pure game of chance where the players are placing bets on a prediction of what number the the ball will land on. The numbers vary from 0 to 36 in most countries but in the USA they have a double zero 00 so the casino profit is greater as the payout odds remain the same. There are a variety of bets players can make, even and odd numbers, numbers that are shown in red or black or top, middle, bottom dozens. The more numbers covered, that will win your bet, the lower the winning odds are. This varies from even money for a simple 1 to 1 chance like red - black, high - low, odd - even, up to 35 paid for each 1 bet if you bet a single number.