Suitable for players aged 6-99 years old. In the process of solving problems, players can effectively exercise the brains reaction ability and logical reasoning ability.
There are 9 rows and 9 columns on the 9*9 chessboard, and 9 disjoint 3*3 nine-square grids. Fill in the numbers 1-9 in the remaining spaces to make each row, each column and each 3*3 nine-square grid All contain exactly one digit from 1-9.
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