We had 8 people ages 11, 12, 14, 15, and 4 adults. Everyone took an active role and everyone helped solve different pieces of the mystery. I believe they allow 12 in a room at a time (please check with them for exact details) but we were the only ones there so we didn't have anyone join us. They do have private rooms as well, but we didn't go that route and took our chances on not having anyone else join us. Honestly we had so much fun. Two of the kids and 3 of the adults were very leery about this and how much fun it would be (I was one of them!) and we all LOVED it!