Super Mario Bros. Deluxe 2

Super Mario Bros. Deluxe 2 is a planned Game Boy Color version of Super Mario Bros. 2 (aka Super Mario USA in Japan) going to be developed by Nintendo EAD and published by Nintendo and it is going to be released for Game Boy Color, but it was cancelled and redeveloped into a Game Boy Advance title known as Super Mario Advance. Only four prototypes from 1999/2000 known to be exist.