The Wily Egg's overall shape is that of the Death Egg that Dr. Eggman has built before, but it possesses the imposing skull motif that all of Dr. Wily's fortresses are known by. The interior is familiar fortress standards by both doctors, containing, as noted by Sonic and Mega Man, "Bridge beams and exposed superconductors" and "narrow platforms over armor-piercing spikes" along with slews of iconic mooks from both doctors' robotic armies.