Guardian War

While playing, hold Left Shift + Right Shift + C and let go. Then press Up, Down, Left, Right while the screen is paused. A japanese debug menu will appear from which you can become invincible, increase your strength, warp to a store that sells everything, etc. Here's an english translation courtesy of Chris Warren.

Load Game - load a saved game or start a new one.
Equip: examine and equip characters, similar to the Equipment option on the regular menu.
Gems = 10000: increases your gem total by 10000. Can be used repeatedly to give yourself loads of dough.
No Battles: prevents enimies from attacking you, although you can't attack them either. Can be toggled on and off.
Coordinates: shows you X and Y coordinates of your location when in a location, and also your "coordinates on the main map. Can be toggled on and off.
Free Movement: You can walk to (almost) any location on the map without clearing previous locations of enimies. Can be toggled on and off.
All Attacks: You can use all weapon and magic attacks during battle by choosing from a massive menu. Can be toggled on and off.
God Mode: You don't lose any HP or MP during battle. Can be toggled on or off.
Map Detail: Gives you a mind-numbing amount of detail when examining the map of a location.
No enemies or treasure boxes.
???: Unknown
Basic+1: Increases the basic level of the currently selected Golem by 1.
Class+1: Increases the class level of the currently selected body or sub-body by 1.

Start a new game or load a save, then press L Bumper + R Bumper + C at the map screen. The screen will freeze here (don't worry, this is supposed to occur!) The, press the following buttons:Up, Down, Left, Right Once this is done, The Japanese debug mode menu will be displayed. Here's what each of the fourteen selections does (choose as many as you like): 1. Start/load a new game2. Player status menu (You can equip characters with new bodies and equipment here)3. Shop (you can buy any weapon, item, or body in the game here) 4. Press A to get 10000 gems (you can use this multiple times)5. Allows you to pass through a battle map without combat 6. Displays X and Y coordinates in combat 7. Allows free over world map movement (go to any location on the map) 8. Enable all attacks/magic spells for all your characters 9. Prevents HP/MP loss (Invincibility) 10. Displays Japanese interpretation of the map during combat. 11. Japanese map interpretation II 12. Makes an odd sound effect (doesn't affect gameplay as far as I know)13. Press A to increase your basic level by one 14. Press A to increase your class level by one

a) First go to the Japanese debug menu as submitted by Chris Warren.

b) Select items 5-10 and highlight them all at once by scrolling down and clicking the A button.

c) Then press B. You will then have no enemies left in that level and can proceed to the next level.