Puzzle areas generally take the form of a room or series of rooms through which players must proceed in order to win. The aperture gun makes it possible to create a portal in order to get to out-of-reach areas, drop onto moving platforms, or retrieve distant objects. That fairly simple formula produces some fiendish puzzles which invite the player to repeat them many times over. That's good, because the game is unfortunately quite short, with only a few hours of game play to finish off the main story. And finishing is required the charming little song at the end makes the struggle well worth it.