Amagon is a challenging side-scrolling action game developed by Aicom. You play as Amagon, a Marine stranded on a monster-infested island after a plane crash. Your goal is to reach a rescue ship on the other side of the island using only a rifle with limited ammo. A key mechanic is the 'Mega-Key,' which allows Amagon to transform into the hulking 'Megagon.' While Megagon cannot use firearms, his physical attacks are eight times more powerful, allowing him to crush foes with brute force. Originally released in Japan as 'Totsuzen! Machoman,' the game is famous for its high difficulty level and unique transformation system.