PlaySudoku.us
Hard · Puzzle #966
7
5
6
1
8
4
2
9
6
8
5
6
4
2
9
3
3
8
8
5
7
9
4
2
3
7
1
7
9
7
Mathematical researchers have shown that the minimum number of givens (17) applies uniquely to the standard 9×9 format.
Mathematical researchers have shown that the minimum number of givens (17) applies uniquely to the standard 9×9 format.
Graph coloring and Sudoku are equivalent problems. Each cell is a node; edges connect cells that share a house. Solving Sudoku = coloring the graph with 9 colors.
Graph coloring and Sudoku are equivalent problems. Each cell is a node; edges connect cells that share a house. Solving Sudoku = coloring the graph with 9 colors.