Oh, cool puzzles. I'm not sure if I bugged the book one or if you just made it so you don't need to do the last colour possibility but either way, cool game and cool puzzles. For some reason the lever puzzle stopped me for a minute.
Thanks for playing! There should be 4 books. When you pick one up you can place it between the bookends. When you have another book, you can swap it with the one you are carrying. It *should* require all 4 books. If it didn't you might have found a bug.
