A Koopa Zapper (name not confirmed) is a hazard in the stage Koopa Cape in Mario Kart Wii. It is an obstacle in the under water tunnel that has three electrical bolts with a green shell in the middle. It spins around, and if one hits it, they will spin out and will be temporarily shrunken to a small size, similar to the Lightning item. The last one, near the exit of the tunnel, goes considerably faster than the previous ones, but it is still really easy to dodge. However, this hazard did not appear in Mario Kart 7's Koopa Cape, which instead had racers dodge Cheep Cheeps swimming towards them.