The Library is the first part of Forgotten Hill Disillusion. You play it for free and decide whether to unlock the rest of Disillusion. I paid the $4.99 for the unlock and it was well worth it. Ads were removed and hints were available for that price. (Note that this is not true of all FH games. I recently downloaded FH Fall, paid $1.99 to get rid of ads, then then discovered that I was still getting long ads when accessing hints. The developer wanted an additional $5.99 to remove the ads from hints! No sale there, and that game was very short to boot.)Game play here was very long. Some puzzles were obscure, but not impossible. You have to be observant. I liked the fact that, after giving you two hints to help you, the third hint completed the puzzle giving you a skip option. This was very helpful for the kind of puzzles where you are spinning rings, etc. Those drive me crazy and after I’ve been at it a while, I’m happy to throw in the towel. The camera was useful. The storyline was good. All in all, though it’s no House of DaVinci, and not quite as good as Rusty Lake Cube series, this was one of the better games I’ve played in a while.