To really enjoy most of the games, you would probably have to be at least 10-12. Many of the games have harder physical and mental challenges.
I dont think they have an age restriction. I feel it would be impossible for younger than 7. Which (7) is their age restriction. While my 8 year old kept up and had some of the best ideas on winning games.
Yes any younger than 7 or 8 and it would be extremely difficult if not impossible for them to participate in any of the challenges.
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