Unlockable Characters To unlock characters complete the following:
Play as Patty: Successfully complete Chapter 1 to unlock Patty.
Play as Rhombus: Successfully complete Chapter 2 to unlock Rhombus.
Play as Vault Dweller: Successfully complete the whole game.
Unlockable Videos and Pin-Ups: To unlock a level's cut-scenes, simply complete the chapter. Once you fully complete the game, you can access pin-up photos, and tons of concept art in the Bonus option of the main screen.