PlaySudoku.us
Hard · Puzzle #850
5
6
2
3
9
6
4
8
5
6
9
9
2
3
4
5
1
9
7
8
4
1
8
3
6
3
1
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.