- ALL STAGES:
AT MAIN MENU, HIGHLIGHT CREDITS THEN PRESS SQU+TRI+R2.
- INVINCIBLE:
AT MAIN MENU, HIGHLIGHT CREDITS THEN PRESS SQU+R1+R2.
- ALL UPGRADES:
AT MAIN MENU, HIGHLIGHT CREDITS THEN PRESS SQU+TRI+L1.
NOTE: There is no confirmation sound or message.
These codes can only be used one at a time, and seem to only work if entered once. You may have to restart the game and try again if it didn't work the first time.
