In this version:
Unrelatedly, if you're interested behind the way puzzle games are made, I recently spoke to Rock Paper Shotgun about my design process, alongside Jonathan Blow (Braid, The Witness) and Jonathan Whiting (Traal, Craequ). Read it here: http://www.rockpapershotgun.com/2015/01/22/how-to-make-a-puzzle-game/