Mickey’s Speedway USA (N64) is Transfer Pak compatible with the Gameboy Color version of the same name.
When the GBC cart is inserted into the TP, Huey becomes a playable racer. However, it took a few attempts to get this feature to work. If it doesn’t work for you, keep resetting until it finally takes.
Huey, also known as the “red one,” isn’t the best racer in the game but he is one of the fastest. Also, eagle-eyed players will also notice Huey in the Trophy cutscene which means there are actually two Hueys in this N64 Mickey’s Speedway timeline – a developer oversight! Whooops!
