From the Super Mario Wiki
Peak-a-boo-boo is one of Fronk's microgames in WarioWare: Twisted! and returns as one of Penny's microgames in WarioWare Gold. The name is a pun on "Peek-a-boo", and the word "boo-boo", which is baby talk for scratches.
The game's purpose is to make the hand remove the bandage from the leg.
Names in other languages