Invincibility: - Press A, A, Up, B, B, Down, A, B and Start at the credits screen.
View end game sequence: - Press A, A, Up, B, B, Down, A, B, B, Start at when the 'Press Start' screen appears.
Level 2 Select: - Press Left, Up, Right, Down, Up, Right, Left, and Up at the credits screen
Level 3 Select: - Press Left, Up, Right, Down, Up, Right, Left, and Left at the credits screen
Level 4 Select: - Press Left, Up, Right, Down, Up, Right, Left, and Down at the credits screen
Level 5 Select: - Press Left, Up, Right, Down, Up, Right, Left, and Right at the credits screen
Level 6 Select: - Press Left, Up, Right, Down, Up, Right, Left, and Select at the credits screen
Level 7 Select: - Press Left, Up, Right, Down, Up, Right, Left, and B at the credits screen