Sudoku 10×10 – Hard
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About Sudoku 10x10
This Sudoku variant consists of a 10x10 grid made up of 5x2 subgrids (called “regions”). Some cells already contain numbers. The goal is to fill the empty cells with one number each, so that each column, row, and region contains the numbers 1 through 10 exactly once. Each number in the solution thus occurs only once in each of the three “directions”, hence the “single numbers” implied by the name of the puzzle.