Mario is Missing! is an educational game created for MS-DOS, the SNES, and the NES. The gameplay was widely panned by critics, although its Super Mario World music remixes have gained recognition. Mario is Missing! was released in floppy disk format for MS-DOS in 1992, with the CD-ROM Deluxe edition and console versions released the following year. A follow-up called Mario's Time Machine was eventually produced. This is the first game where Luigi is the main protagonist with Mario in a supporting role and it was the only solo adventure for Luigi until 2001 when Luigi's Mansion was released on the Nintendo GameCube.