- Cup: Lightning Cup.
- Course position in cup: 4th.
N64 Bowser's Castle is a course that originally debuted in Mario Kart 64. The Mario Kart Wii version has several differences.
In this version, lava columns spring out from the pits to cause the drivers to bowl over, specially when racers attempt to jump. The green Thwomp present in the Nintendo 64 version is no longer there, instead it is replaced by a normal thwomp that looks no different then the rest, however it will shake and make an angry expression when a player comes near, and also laugh. The flame-shooting statues are still harmless. Bowser's laugh is still heard on entry on the final lap, or when the player gets too close to the Bowser statue at the start of the track. It is the longest track, taking around one minute per lap, and one of the most difficult tracks in the game.