I think this game pulls off something insane for a puzzle game, that being that it maintains a sense of surprise and problem solving even after a replay. I feel like I go back to Portal 1 and 2 and everything is so simple to remember how to complete, but something about how simplistic all of the clues are and how they're represented makes them easy to forget in hindsight, giving the player a situation where they basically have their memory wiped after a couple of months away from the game. Also, anyone who's played the game can appreciate what starting from square one does in regards to a fresh perspective. Johnathon Blow did a damn good job with his team in directing this game, and besides a couple painful puzzles like the shipwreck door and the sun smeared panels, it's basically a must play for any puzzle game respecter.