Press Up, Up, Down, Down, Left, Right, Left RIght, R at the item screen.
After completing both scenarios for your character you will unlock Extreme Battle Mode which can be found in the Special option.
- S: Beat the game in 1:30. Use only One herb. You cannot use weapon upgrades, special weapons, and you cannot pick up a single weapon more than once.
- A: Beat game under 3:00, don't use any first aid kits or special weapons.
- B: Beat game under 3:00
- C: Beat game in 5 to 7 hours
- D: 7 or more hours
