Wasn't sure what the book did, but nice twist of classic Snake game!
Viewing post in Snake eats blocks jam comments
The book unlocks new types of blocks, and i know, it's extremely unintuitive - i was originally planning for more of an level up system where you needed more of those books to learn new blocks and an indication of unlocking them, but i had to settle on the current system due to the lack of time.
In any case, thank you for your support!