PlaySudoku.us
Hard · Puzzle #901
4
5
2
9
1
7
5
9
2
8
7
8
5
9
3
6
4
6
8
2
7
6
2
7
4
5
8
After finishing any puzzle, go back and find every naked pair and hidden single you used. Catalog your techniques.
After finishing any puzzle, go back and find every naked pair and hidden single you used. Catalog your techniques.
The word "Sudoku" comes from Japanese: "Su" (数) means number, "Doku" (独) means single.
The word "Sudoku" comes from Japanese: "Su" (数) means number, "Doku" (独) means single.