Both the original and this sequel are absolutely superb games. The first one has been in my top 5 games ever since it came out, and this sequel managed to go above and beyond my expectations! I did nothing but play it till I had completed everything and tried my hardest to find as many secrets etc. as I could with no looking up anything. Gonna do another run but let myself look up hints for secret things I couldn't fully figure out the first time.

This sequel did the same that Portal 2 did, absolutely deliver well beyond any reasonable expectation.