Puzzle is a good game to develop children's intelligence and can adjust children's emotions. Toys like puzzles, ranging from a dozen to hundreds, are basically affordable for every household. When my sister was four or five years old, she liked puzzles very much. When she came out and saw something for sale, she had to buy it, and it became more and more difficult. I had to fight for it for a long time. My sister did research there quietly when she bought it, and finally she was better than us.