I was curious because I found it in the principal's office at the junior high school, so I bought it. It's simple, but it seems addictive, and the children got hooked on it. The outer bag shows signs of use, but the contents are undamaged and in a clean condition. The following is a quote from Amazon ↓ Difficulty Level 2, LEVEL 2, for beginners to intermediate players Total of 2339 patterns Brain stretch Take out the pieces and put them back in the case. Just that is incredibly difficult. Product dimensions: 21.5 cm length x 19.8 cm width Theme: Brain block Difficulty: 2 (2339 patterns) Target age: 6 years and older Material: Plastic