At the character selection screen, highlight the "?" box, press Select(7), then press any button.
At the character selection screen, highlight Gallon, hold Select, then press all three Punch or Kick buttons.
At the character selection screen, highlight the "?" box, press Select(5), then press any button.
Play as Oboro (Shin Bishamon)
At the character selection screen, highlight Bishamon, hold Select, then press any button.
More Cheats, Achievements
