Level select:
Hold X + Y + Z at the start screen until the password prompt appears. Enter Up, Left, Down, Left, Right, Left, Down, Up, Left, Right, Right, Down, Right, Right, Up as a password.

Super password:
Hold X + Y + Z at the start screen until the password prompt appears. Enter Left, Left, Left, Left, Down, Right, Right, Left, Left, Down, Right, Down, Left, Up, Right as a password to start at the final level of hidden island 5-B with all secrets.

Status	Password
Level 1, Boss 1	UURRUDULRDRULDU
Level 1, Boss 2	UDRRULULLDLDLDU
Level 2, Boss 1	UUURULULLDRDLDU
Level 2, Boss 2	UURRUDULUDLULDU
Level 3, Boss 1	UDURUDULUDRULDU
Level 3, Boss 2	UUURULULDDLDLDU
Level 4, Boss 1	UURRUDULLDUULDU
Level 4, Boss 2	UUURUDULRDDDLDU