Doomsday Zone is the final zone in Sonic & Knuckles, released in 1994 for the Sega Genesis and developed by Sonic Team. It is unlocked for Super Sonic and takes place in space during a pursuit of Dr Robotnik after the Death Egg falls. Players must collect rings to stay transformed while dodging asteroids and chasing the fleeing ship. Its music became one of the most remembered boss themes from the classic Sonic era and is still shared online for intense gaming moments.