As early as January 1997, a cancelled sequel for Super Mario 64 was in development, commonly called "Super Mario 64 2" or "Super Mario 128" (not to be confused with the tech demo of the same name) for the failed Nintendo 64DD expansion. Only one demo was ever made, but was never shown to the public. Luigi was planned to feature in it as a playable character, and anywhere from two to four player co-operative play was planned. Shigeru Miyamoto once said he hoped to make the game as complex as Banjo-Kazooie, and joked that the box art for the game would be green if the demand was strong enough for Luigi.