Rolling Stone

Rolling Stone (ローリングストーン) is a defense system to repel intruders, rolling down when a intruder approaches it. It breaks down after hitting a wall. It appears in Soldier Stonekong's stage.

Metal Stone
Metal Stone (メタルストーン) is a improved version of the Rolling Stone that is immune to attacks, but like the Rolling Stone, it breaks down after hitting a wall. It appears in the Crimson Palace.