The boss arena is a sloping E-shape. Sonic is first beset by waves of miniature crab Badniks crawling down the inclines, but they are easy enough to avoid simply by spin dashing. When Kani Pearl finally materializes, the mechanical crustacean simply scuttles sideways back and forth along the upper level. Impervious to damage while its shell is closed, the boss should be attacked when it flips open its armor to fire a pearly bullet in Sonic's direction. Five hits are required to destroy it, and Sonic can grab the Chaos Emerald.