We just did the Witching Hour with a group of 8 (this website only says it goes to 6, but they definitely allowed 8). We succeeded using one hint and a bit of finesse to avoid solving the last part of a puzzle. There was SO MUCH to do, I don't see how we could have gotten through with less than 6 people at least. There were so many types of puzzles, and we kept being pleasantly surprised. Katie was our gamemaster and was fantastic at staying in character (it felt really good to see she was legitimately proud of us for completing!)