Rolling Stone

Rolling Stone (ローリングストーン) is a defense system to repel intruders, rolling down hill when an intruder approaches it. Two appear in Soldier Stonekong's Deep Forest stage. They break down after hitting a wall, but if the player has enough attack power and is persistent, the stones can be destroyed.

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