----- IMPORTANT ------ The harder you make the book, the more impressive the design (or how to get) needs to be. Don't keep submitting super hard books if the designs is 3 squares and a circle, ok? Even tho the Game still isn't out yet, you can start to make submissions! Who knows, maybe it'll get added... (The higher the difficulty, the less probability it'll be added)
btw there is a how to get inside go to backdrop 2