overall, a brilliant game. the writing, and particularly voice acting, was amateurish but not a dealbreaker.
puzzles were brilliantly designed and i loved how creative they got with only the 1 portal - but i thought them a little on the easy side, and the connecting segments dragged out.
the achievements were fun too. i had no trouble doing them guideless, though i did check the maps for fingerprinter
It's a mid-quel taking place between the two #Portal games. It introduces a couple new mechanics for puzzles, most of which were fun to toy around with.
There's a a few cool scripted "Valve moments" too, which is neat for a mod. The writing has its good and bad moments, a bunch of jokes felt a little forced, but I liked a lot of the little character moments with the second core you meet.