You need at least 1 GM and 1 Player. We recommend a GM and 3-5 players to get a really good game out of it though. We've been considering making a solo version, and, if that's something you want please tell us!
Oh! also forgot. Game time is up to you, but it's best as a 1hour + game. When we tested, we ran 2 hours sessions, but it can go longer if people want.
