Roulette is perhaps the most popular game played worldwide. It is played in every major casino and is the primary game played in Europe. The game consists of a wheel marked with numbers 1 through 36 and American roulette has a 0 and 00. The numbered portion of the layout is called the "inside." Additional bets can be made outside the numbers and this area is called the "outside." In this area you can also bet just black or red numbers.