It is one digit but it adds to the degree of difficulty in the American game. When you play American Roulette, the house edge is 5.26%. European Roulette has a house edge of 2.7%.

The Nevada Gaming Control Board said in 2023 ... from 0 to 36 (some tables also have 00 and 000). On the standard roulette wheel, zeroes are green, numbers 1-10 and 19-28, odd numbers are red ...