Activate the following cheats by entering the corresponding passwords:

CHEAT FUNCTION - PASSWORD
Level select - Enter ILOVEU or ILUVU as a password.
Reveal items - Enter MIEMIE as a password. A silver star will appear during the game in locations where you can collect a bonus life, gold star, or treasure.
Configuration mode - Enter MAGURO as a password.
Time attack mode - Enter DOFEEL as a password.
Boss rush mode - Enter MUSEUM as a password.
Super hard modes - Enter SUPER or SUPERB as a password.
View credits - Enter AGES as a password.
Reversed demo high scores - Enter HETAP as a password.
Disable all codes - Enter XXXXXX as a password.