Thirty continues:
Press Select(7) on controller two at the title screen. A sound will confirm correct code entry.

Special weapons:
Press Start(7) on controller two at the title screen. A sound will confirm correct code entry. Nine additional weapons will be available for selection.

Extra easy difficulty:
Press L(7) on controller two at the title screen. Set the game to the Dynamic setting.

Extra hard difficulty:
Press R(7) on controller two at the title screen. Set the game to the Almanic setting

Play as Bosses:
Hold L + R on controller two when starting a new game. Use controller two to play all Bosses in the game.