These passwords are for the action setting.
The passwords are for the arcade setting.
The passwords are for the comat setting. This is for 2 or more players but can be explored by 1 player.
Passwords for the easy setting.
These passwords are for the exploration setting.
At the title screen, press and hold Option 2, then press and hold Option 1, then press and hold the up + right arrows, and then release all the buttons. There is no confirmation that the cheat is activated until you start playing. Press the Option 2 button while still at the title screen if you want to turn the "music" back on.
These passwords are for the logic setting.