However, more complex bets are available in roulette, and understanding the roulette odds for those bets is essential. For example, the red/black and odd/even wagers and the single number bet. Many roulette bets will be familiar to even casual casino players. Rules of the game state players must make all wagers before the wheel has stopped spinning. When the ball rests in a pocket, its position will decide if your bet was successful. When you start a new game of roulette, the croupier spins the wheel and then drops a metal ball into the rotating mechanism. American roulette adds an extra pocket with a double-zero section, making 38 pockets in total. The European one is made of 37 pockets showing the numbers 1 through 36 and a zero. There are certain differences between the American and European roulette wheels. Most people are familiar with the basics of roulette and even making some old-school roulette bets.