Matthew Brown of Hexcells/Crosscells fame released a new "game" called Alchemia, it's just a book that you can turn the pages back and forwards on, a fictional book on alchemy that has to be deciphered page by page for some unknown end. There's no interaction other than turning the pages, and you have to use the internet to solve the puzzles. Presumably this all culminates in some secret message or an external website by the author, there doesn't appear to be any form of user input to the game.
I'm pretty well read with a liberal arts degree, can read Latin and parse my way through Greek, and have a decent background in cryptography, and I'm completely lost. So far there's literally no help on the internet, but it just came out a few days ago. It's only $2, but this seems like a complete pet project that is going to be impenetrable to most people. I might bounce my head against it a bit, but I'm happy to donate $2 if it keeps him going long enough to make another puzzle game