Mario is Missing! is an educational video game released for the PC in 1992 and then for the Nintendo Entertainment System and Super Nintendo Entertainment System in 1993. The game was developed by The Software Toolworks (Radical Entertainment for the SNES and PC versions) and published by Mindscape. It is the first game where Luigi is the protagonist and it is the only solo adventure for Luigi until 2001 when Luigi's Mansion is released on the Nintendo GameCube.