Power Piston (パワーピストン,Pawā Pisuton?) is the boss of the second stage of Mr. X's Castle in Mega Man 6, located at the hallway's end. Power Piston stays attached to the right wall, moving up and down, and stomps it to make boulders fall down. The best weapon to hit it with is the Silver Tomahawk, however, it takes practice to aim it properly. The player can also use Blizzard Attack if they run out of Silver Tomahawk.