Control enemies:
Highlight the "Continue" option at the "Continue/Delete Data" prompt and press Start + A. Highlight a saved game and press Start + A to display a prompt to control the game's enemies. Note: This may only be enabled in books one through three.

Rename characters:
Name the main character, highlight the "End" option, and press Start + A. All game characters, including bonus characters, may be renamed.

Turbo mode:
Press Up, Down, Up, Down, B, then hold Start + A + C at the title screen. Keep the buttons held until the main menu appears. Select a name, then quickly hold Start + A + C.

Japanese introduction:
Hold A + B + C and sweep the D-Pad on controller two clockwise at the "Software Planning" screen.

Bonus quests:
Note: A backup RAM cartridge is required for this feature. Successfully complete quests 1 and 2. Start a new game to access a new option for a third quest. Another quest may be played by collecting the museum ticket in the third or fourth battle in quest 2, against the Dark Mage Boss. Locate the well at the top of the battle area, towards the right side of the screen. Collect the museum ticket by searching the well. After completing quest 2, start a new game to access a new option for a fourth quest. This quest occurs in a museum where all Bosses from the three previous quests must be fought.

Bonus characters:

Amigo
Locate the bushes near the lake to the right in the night battle with Gepel during Quest 1. Search these bushes to the right of the drawbridge to find Amigo.