It would be awesome if the book under beta listed what challenges it has been added to in the past so we can ascertain if we want to join that challenge and also to allow us to easily add the book to a prompt. Ie. Shakespeare Macbeth might say “in reading challenge plays, reading challenge Shakespeare, reading challenge poetry”. Etc. I frequently use challenges to find other books I would want to read later. It’s similar to the shelves idea Goodreads had where you could see where other people shelved the book and browse similar moods.

Filters could be challenge drop down - challenges using this book as a prompt, other books recommended from that prompt, number of challenges containing this book.