PROGRESSIVE PUZZLE scientifically designs seven stages according to the development of intelligence of children aged 1-7, each stage corresponding to children of different ages. The advanced system of this puzzle is mainly showed in three aspects. First of all, the number of pieces of puzzle starts from 2 pieces and increases to 247 pieces step by step. Then the content of the illustration changes from a single animal image to a nature, urban and other scenes, and finally to the world's human geography, reasonably expanding the scope of children's cognition. Finally, the artistic presentation of the illustration also has different levels.Purchasing Options:
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