King of Demons (Japanese: Majuu Ou) is a 1995 side-scrolling action game developed by KSS for the Super Famicom, released exclusively in Japan. Known for its dark aesthetic and deep transformation system, it follows protagonist Abel as he ventures into hell to rescue his wife and daughter from demons. Players collect special items to shapeshift into various demon forms, each with unique skills and attacks that boost replayability. Challenging level design, diverse enemies, and skill-testing boss fights define the gameplay. Never officially released outside Japan, it has become a rare treasure for retro game fans, standing out among SNES titles for its innovative mechanics and dark, compelling story, and remains a cult classic to this day.