I believe it's 12 but I'm sure they could be flexible
12 years old, but per their website, give them a call if you'd like to bring someone younger than 12.
It requires a good bit of deductive reasoning and logical thinking so 12 is probably about as young as you'd want to take. Even that might be pushing it a bit for many 12 year old kids.
My niece was about 8 when we went last year.
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