An absolutely stellar gem of a game that takes the natural inquisitiveness that the medium of gaming can foster and lets you run loose with it, using masterful game and puzzle design to guide you towards many, many, MANY incredibly satisfying "A-ha!" moments. Guaranteed to leave you feeling as if a small light in your heart has gone off when you're done. At least I still have the DLC, but the idea of there being less of this jaw-dropping universe to explore and puzzles to solve, now, that I've finished it... ah, my heart... I can barely take it... One of the greatest gaming experiences there is.