Ginga Ojousama Densetsu Yuna 2

Debug Mode
At the title screen, press Up, Down, Right, Left, I, II, Up, Down, Right, Left, I, II, Run. At the next screen, press I and you'll be taken back to the title screen. Press Run to enter the Debug Menu.

This Debug Mode enables various options during battle, which are accessible with specific button combinations:
 * Drain Your Energy - hold Select and press Run.
 * Modify The Humor Meter - hold Select and press Right or Left.
 * Recover Energy - hold Select and press Down.
 * See The Enemy's Cards - hold Select and press Up.
 * Set All The Enemy's Cards To The Same Type - hold Select and press II.
 * Set All Your Cards To The Same Type - hold Select and press I.