I made a hint system in Twine for my game HAX. I know I made a couple of the puzzles a little bit too obscure, and some of the comments on the Free Indie Games post about it mentioned the two in particular that I was concerned about. So here is a handy hint system that covers every puzzle in the game, as well as the secret room, and a simple HTML table map. Each puzzle has two or three hints before giving you the full solution. The links are orange because it reminded me of those hint books for old games where you used a highlighter to reveal the answer.
I tested it, but if there are any problems with links or if I missed something, please let me know. I hope this helps!