Super Mario 128
In November 1999, Shigeru Miyamoto said, "Well, for over a year now at my desk, a prototype program of Mario and Luigi has been running on my monitor. We've been thinking about the game, and it may be something that could work on a completely new game system." The game had only a demo of one level made for it. Miyamoto claimed that multiplayer functionality was the first aspect of the game that he wanted to include.