La Partage and En Prison are two roulette rules which appear regularly in French Roulette. They must be used with even money bets. Essentially, they mean that when the ball lands in the zero pocket, you do not necessarily lose your bet. La Partage will see half your bet returned. En Prison sees your stake kept in prison for the next round. If you win, it will be returned to you. If not, it is lost. It is these rules which help drop the house edge in French Roulette down to 1.35%.