Bonus Games:
Complete the game by the good ending. This to unlock:
Bounty Mode:
Complete the Game.
Scavenger Mode:
Earn at least 69,001 or more in any mode.
Nightmare Mode:
Beat Scavenger Mode.

GunBlade:
Complete the game once to use GunBlade during replays.

Reset the Game:
Press during Gameplay: Start and Select and R1 and R2 and L1 and L2.