Made from high quality all wood construction with deeply burned laser engraved numbers from a shop in Spring Hill, FL. The blocks stay as a string but will rotate individually. The idea is to rotate them until there is a correct equation on all 4 sides of the blocks. The equation is read from left to right. The 9 block model is very difficult with 16,384 possible permutations of the blocks but only ONE correct solution.
Dimensions: 6.5" long, 3/4" blocks
Difficulty level: 4 (out of 6)
Suggested age: 7+
Wasn't sure about this one, as I bought it for my 15 year old daughter. It was/is a huge hit for everyone in the family (friends included). It involves math, simple yet still math. So far, a week out from getting it, she's been able to solve 2 sides. In order to complete solve all four sides must be accurate. Like many of the puzzles around our home this will be put down and picked up hundreds of times. Well worth the purchase.