Popular puzzle with numbers. The playing field is a square 9 × 9, divided into smaller squares with sides of 3 cells. Thus, all the playing field consists of 81 cells. They are already in the beginning of the game are some numbers (1 to 9), called clues. The player is required to fill the empty cells with numbers from 1 to 9 so that each row, each column and each small square 3 × 3 each digit would meet only once.
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