Extra Healing
While using medicine after dying, hold button II to completely fill your life meter.

Subweapon Shop
In the first village enter the house that leads to a well, fall down the well and turn left towards the door that usually gets you back up to ground level. Now position yourself on that very door, jump in place and hold up in mid air. A secret door opens just over/above the first door. Most subweapons are sold here.

No Door Sounds
To remove the door sound, enter the password PLAY THE ONGA KUN.

Start in Human Form
To start the game in human form, enter the password MODE FOR OOOO OOO.