The Undercover Monkey is a tower (road item?) that looks like a bloon with a monkey face on it. (It is actually a monkey hiding inside a fake bloon to trick the bloons.) Unlike other towers, it is placed on the bloons' path. It moves along the path like a bloon, dealing one damage to all bloons it touches. When it gets to the end, it disappears. The Undercover Monkey costs $175.