Play Super Mario World - Nightmare Edition Online

Super Mario World - Nightmare Edition is a fan-made hack of the original 1991 Super Nintendo Entertainment System (SNES) game published by Nintendo. It takes the familiar framework of one of the platform's most recognizable adventures and twists it into a much more demanding and sinister experience, reflecting a creative subversion of the source material rather than an official release.

You control Mario through a heavily altered version of Dinosaur Land, where the primary objective remains navigating side-scrolling levels to reach the goal, though now under far more oppressive conditions. Signature mechanics include navigating levels filled with unpredictable enemy spawns and traps, often requiring pixel-perfect jumps and memorization of new hazards. The pacing is deliberately tense, with a significantly heightened difficulty that punishes even minor mistakes. It feels like cautiously navigating a familiar place that has become actively hostile.