Green Boo

A Green Boo is a type of Boo found solely in Super Mario Bros. Deluxe. In the You vs. Boo mode, the player will eventually encounter the Green Boo as an opponent in racing. When the player beats the White Boo a certain number of times during a race, it will forfeit. After this, the Green Boo will enter the competition. The Green Boo is slightly faster than the White Boo, and will occasionally speed up greatly during certain parts of the race, giving the player a greater challenge. Once the Green Boo is defeated, the Red Boo will enter the competition.They also appeared in the minigame Peek a Boo from Mario Party DS if the Boos have different colors.