It is a puzzle that puts numbers from 1 to 9 in a 9x9 square.
A game to play with numbers that are booming all over the world! No math skills required.
< rule > Put a number from 1 to 9 in an empty cell. Do not put the same number in each of the vertical and horizontal columns. Do not put the same number in a 3x3 block surrounded by a thick line.
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