And after a week of trying, I'm giving up. I have every puzzle done outside of the Challenge. I can not get past it, regardless of the number of times I've tried or the methods used. I'm simply not a fast puzzle solver.

It's also completely taken the fun out of the game for me. I like puzzles. I enjoy a fair challenge. Had the puzzles been entirely random each time like the door to the ending; without the added time constraint, I'd have enjoyed this part quite a bit. Or if they'd chosen to go with the time constraint, make it shorter, and kept the puzzles set, I'd have likewise enjoyed this part. Doing both just made it tedious and unenjoyable.