This page talks about the Battle Stage. If you want to see the information on the game system click here.
Nintendo GameCube is a Battle Stage in Mario Kart: Double Dash!! It takes place in an outer-space-like area, and the platform is the top of a Nintendo GameCube with glass walls around it to keep the player(s) from falling off.
The stage looks exactly like a Nintendo GameCube with only a couple of changes. One change is the middle of the top of the GameCube. Originally, the logo on the GameCube was the logo for the GameCube. Instead, they changed it to where it is the logo of Mario Kart: Double Dash!! with Mario and Luigi on the Red Fire kart in the background. This course is certainly one of the simplest and smallest courses in the game.