We have been doing logic dogs, mainly to train the ability of mathematical logic thinking. The feature is a template, which children can imagine as driving and improving their interest. Because it is imported from abroad, some topics are not in line with China's national conditions, but they are generally good. If you don't dislike what others have used, you can find a second-hand one with higher cost performance. There are many contents in the multi-family exchange series, including mathematics, intellectual games, paper-cutting and hand-drawing, maze walking, English and so on. You can search on Dangdang. We have done a lot, too. On the whole, its cartoon image is the cutest, Japanese style, but the age marked is too small, such as 4 years old. Actually, three years old is enough. If you really wait until you are 4 years old, you will find it easier. I prefer his hand-cut series, which is very interesting. Later, I bought a series of hand-cut products with great development potential, which were made in Korea. I feel better than many tigers, because most of them are two-sided, the development is one-sided, and the reverse is white paper. Recently, I have been paying attention to ladder mathematics and read it in the bookstore. Its characteristics are systematic, mainly reflected in mathematical logic, but we have many such books, so we will not consider them for the time being. If you want to buy it, you might as well buy a stage first. The above personal views are for reference only.