Enter these codes at various points to unlock their effects.
Alternate ending:Clear the game without killing more than 13 enemies. (asteroids and bosses in the Asteroid Zone excluded)
In Guadia Quest Saga, once you've gotten to the bottom of the tower, go south as far as you can. Around there you should see a small town, enter it. If you go to the building with a bunch of ducks walking in it and choose to LOOK around the middle, a stairway will appear. Go down the stairs and talk to the man there. Talk to him and continually answer him with the first answer, and you will be taken to the credits of the game!
Enter these codes at various points to unlock their effects.
Once you have cleared the second Kachou wa Meitantei game, "kouhen", enter the following on the title screen to be able to play freely the boat chase part of the story mode. Note : Will NOT work if you haven't cleared the game.