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Sudoku

Sudoku puzzles contain 81 squares and are divided into 27 areas: nine rows, nine coloumns and nine 3x3 subgrids.

A Sudoku puzzle is solved by placing numbers so that each 9 square area contains all the numbers from 1 through 9.

4 8
4 8 2 7
3 5 2
8 4 6 2 3
2
3 6 9 1 5
2 4 5
6 2 3 8
3 6

puzzle

Blank: 52