Excellent beginner/intermediate puzzle box in an escape room style. Was great to do together as a family with precocious kids aged 8 and 12. It was not too difficult for our 8-year old to meaningfully participate, and was challenging enough to hold the interest of our 12-year old and grown ups, though I think the grown ups would have found it a bit too easy if we were doing it on our own. The Iceland pics and info and the Jules Verne backstory added a lot to the enjoyment. Now we’re planning a trip to Iceland!