Cosmic Fantasy 4: Part I

Debug Mode:
Enter Nya-N-NO-SHI-PO as a password, with Nyan in Katakana and the rest of the name in Hiragana.

Hidden mini-game:
Enter Nya-N-TA TA KI as a password, with Nyan in Katakana and the rest of the name in Hiragana.

System 3 card warning screen:
Enter VER1 as a password.

Sudden RPG mode:
Enter LASER as a password.