This "book" documents various development related things of the roguelike game Zorbus.
There's no code in this book, the game is closed source, and there's no easy way for players to edit or modify it, but still, other hobby developers might find the methods and other stuff documented in it interesting.
The book is just 30 pages with many images. This was meant to be more comprehensive, sort of closure to the game project, but I just don't have the time nor interest for more than this at the moment. I might however update it in the future.