Genkottsu

Genkottsu (generically referred to by Nintendo Power as mechanical fists ) is a trap which Mario faces in Super Mario Land 2: 6 Golden Coins. If Mario steps on the wrong trigger panel in the Mario's castle level, a giant, mechanical gloved fist trap in the resemblance of Wario's glove will come crashing down, pounding the floor with spiked brass knuckles at immense speed (although it is slower on Easy Mode). Mario will have to get past three of these traps in total in order reach Wario and rid him from Mario's castle.

Trivia

 * If Mario jumps over the center trigger panels in the areas with these enemies, the trap will never be triggered and he can walk on by. He must jump over the center trigger panel three consecutive times in order to avoid confrontation with all three of these fists outright.