Robo-Mouse

Robo-Mouse is an invincible enemy appearing in Wario Land 3 in The Stagnant Swamp and The Peaceful Village.

Robo-Mouse is, like its name implies a mouse-like robot with a tail, wheels to move and claws to destroy walls in its way. When it sees Wario, it'll chase him and try to catch him with its claws. If it does, it'll kick Wario out of the area.