I think there were a few instances where I filled out a section by using what I know and working out the rest by reading writing and filling in what makes sense. Felt like cheating.the end isn't even the end. you haven't finished the game if you haven't played the extra coop levels.
The game does feel like all the evidence is there though and i it was fun working it out but it did fell like the game peaked after the first few chapters and then went downhill. The puzzles seem to get lazy at times.
I spoke to soon about Portal 2. I thought I was as the end when I last posted but there's been 2 more chapters.Spoiler for Hidden:
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