Excitebike 64 (Nintendo 64)
CheatingDome.com
Big Head mode
Enter BLAHBLAH at the cheat menu
Get Cheat Menu
Hold L, C Right, C Down, and the A button at the main menu.
Mirror Mode
Enter YADAYADA as a code.
Night Mode
Type "MIDNIGHT" at the cheat code entry.
Small head mode
Enter PINHEAD as a code.
Stunt Bonus
Enter SHOWOFF at the cheat menu.
Turn all riders invisible
Enter INVISRIDER at the cheat menu.
Unlock 3D NES Excitebike
Finish 1st in the Challenge Round of Pro Season.
Unlock Hill Climb
Finish 1st in the Gold Round of the Amateur Season.
Unlock NES Excitebike
Finish the Tutorial Mode by completing all the stunts.
Unlock Soccer
Finish 1st in the Silver Round of the Novice Season.