The Riddle of the Sphinx was fun, the riddles were clever and not overly difficult to solve; we used the hint provided in the first envelope and got a sense of how it worked, then didn't need anymore after that. It was a great activity for our group of 6 Girl Scout leaders. Some of the activities are like ice breakers, which was nice because it helped us get to know each other better. I took off one star because of the pricing; it doesn't make sense to me that it costs the same amount per participant, because when you have a bigger group, the tasks are spread among more people so each person has less to do and if some people are quicker than others, then they end up figuring out the answers before others get a chance. Maybe charging the same price per person for 4 people, then a few Euros less per person for 5-6 people, and again less for 7-8.