Codes

Earn Quick Experience for New Character
To quickly earn more experience for a new character, first have a character who is far along in the game but hasn't done all the palaces yet. Have this character beat a palace and go to the place to insert the gem.

When you insert the gem and the experience points start to total up, pause and do the Quick Save. Then, load your new character. All of the experience points which would've gone to the character you beat the palace with will now go to your new character.

No Keys
If you come to a locked door and hove no key you can simply use the Fairy spell and fly right throuogh the keyhole. And sometimes if you have enough magic you can make it through the whole palace just using this trick.

Special Save Screen
At any time in the game press Start on Controller 1. Then on Controller 2 press Up and A to bring up the "Continue, Save, Retry" screen. Use this if you are stuck in a screen with no way out, and no way to lose a life. You can use this code to save your game (so you don't lose the items you have picked up), and start over from the starting screen.