One of the greatest games ever. Improved upon the already very good original in every sense- better puzzles and funnier dialogue, and a longer game to enjoy it over. I absolutely loved the old Aperture Science levels in chapters 6-7, the condemned testing sites were a vibe and Cave Johnson is so fucking funny. It was also cool to learn who Glados actually is. The co-op mode is also fantastic. Not much else you could ask for from this game