Development Hardware
Various development hardware was made available to 3rd Party developers by Nintendo. For the GameCube, these included units with model numbers starting with "DOT" instead of the retail "DOL". For the Wii, it is "RVT" instead of the retail "RVL". It is assumed the "T" in these model numbers stands for "Tool" (Ex. DOT = Dolphin Tool, RVT = Revolution Tool).
Since Super Mario Galaxy was being developed early tangent to the Wii's development, there is a chance physical media exists or once existed for the game on a GameCube NR Disc (model DOT-003) or the GameCube NPDP Cartridge (model DOT-004) and was thus playable on a GameCube NR Reader or GameCube NPDP Reader; possibly the only official instance in which the game was playable in the GameCube assembly line of hardware.