Fighter's Impact Highlight a fighter on the character selection screen. Hold Circle + Square and press Start. Highlight a fighter on the character selection screen. Hold Down + X + Circle and press Start. Push Select(10) at the title screen. A chime will confirm correct code entry. Push Right(10) at the title screen. A chime will confirm correct code entry. Push Left(10) at the title screen. A chime will confirm correct code entry. Complete the game four times to unlock the four hidden characters.