Play Mario in the Castle of WTF Online

Mario in the Castle of WTF is an unofficial Super Nintendo Entertainment System release, developed by an unknown creator. It belongs to that era of fan-made ROM hacks that reimagined familiar games with strange, often experimental twists.

You control Mario through a series of disjointed, glitch-heavy rooms, each with its own unpredictable physics and enemy behavior. The main goal is simply to survive and reach the exit of each screen, though the path is rarely straightforward. Signature mechanics include sudden gravity reversals, enemies that phase through walls or move in erratic patterns, and environments that shift or corrupt as you progress. The pacing is deliberately disorienting, and the difficulty spikes without warning, making each new screen a test of patience and adaptability. Playing it feels like navigating a broken cartridge, equal parts frustrating and fascinating.