Another very interesting puzzle we had, was a bit more creative: There was one part in the game, in the story, where the lead character had to go and fetch a very rare book from a library. And she wasn't allowed in because she wasn't a published author or a researcher. One group of the players thought: Well, if all it takes for her to get into the library is to be a published author, surely the easiest thing to do would be to just go and write a book for her. So, over the next three weeks about 30 people got together on the internet and wrote a 300 page book, published it and by that they solved the puzzle.