Boulder is just that—a boulder. They fall from chutes in Drill Man's stage at regular intervals if Mega Man gets within range. Mega Man can destroy the boulders, which sometimes leave behind power-ups. The chutes themselves cannot be destroyed. Boulders inflict moderate damage, but really become a nuisance once they hit the ground and break into pieces. However, if Mega Man destroys all of these pieces (usually with a charge shot), they can yield multiple power-ups at once, which comes in handy for refilling life / weapon energy. Standing under the chutes with a charged Pharaoh Shot is a safe and easy way to farm pickups.