Press A + B on controller two while in a shop to raise or lower the prices.
Quickly press B, A, B, at the game over screen before the title screen appears.
Enter one of the following passwords to start at the corresponding level with the indicated status.
Level 2-4, invincibility, unlimited feathers
Enter ICARUS FIGHTS MEDUSA ANGELS as a password.
Level 3-4, unlimited potions, many items
Enter PAKING PAKING PAKING PAKING as a password.
Level 4-1, many items
Enter DANGER !!!!!! TERROR HORROR as a password.
Last level, invincible, three treasures
Enter 8UUUUU UUUUUU UUUUUU UUUUUU as a password.
Last level, 9,999,999 points
Enter AuW2e5 XcdF00 mt000G K50Wuu as a password.