There are no age restrictions on their website but due to the content and the complexity level of some of their games I would not suggest that you bring small children. Escapology in Orland Park, Illinois is coming out with an escape room soon that is called Save Santa that will be geared toward children and adults alike.
7 and under is free but I would not suggest having all 8 and 9 year olds in a room with no adults. We get many birthday parties 10 and older and they usually play our easier level games.
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