Cheat Menu
Go to the main menu and Hold L + R and press Right, Right, Right, Right.
Get all Tracks
Go to the main menu and Hold L + R and press Up, Up, Up, Up.
Get All Parts
Go to the main menu and Hold L + R and press Left, Left, Left, Left.
Get All Characters
Go to the main menu and Hold L + R and press Down, Down, Down, Down.