Bombchu

A bombchu is a bomb in the shape of a chu (mouse), which is used in the The Legend of Zelda series of video games. When Link uses one, the fuse is lit (if Link doesn't let go of it, it will explode in his hands), then when he releases it, it will travel for a while then explode. Bombchus can go on any surface, so if you face a wall and let it go, it will climb the wall, then probably onto the ceiling as well. These bombs are useful in hitting fixed objects such as crystal switches from afar, but are not particularly useful in battle because exact timing is required to hit an enemy or other moving object.

Sub-games involving the Bombchu can be among the most difficult, challenging the player to hit small wall-based targets within a time limit.

Majora's Mask features an enemy named "Real Bombchu", a malevolent mouse creature with a fizzing bomb on the end of its tail.