Super Chinese 3

Music Mode (おんがく　モード)
Enter the password "あいう". Press Up / Down to change the sound index by 1, Left / Right to change it by 16 (in hex), and A to play it.

Information Mode (じょうほう　モード)
Enter the password "ぱぴぷ". Controls are the same as above. Press A to watch any of the game's cutscenes.

Message Mode (メッセンジャー　モード)
Enter the password "なにぬ". Controls are the same as above. Press A to view any of the game's messages.

Maximum Power
The passwords "かきく" and "たちつ" fully max out your character's stats.

Credits
Enter the password "さしす".