PlaySudoku.us
Expert · Puzzle #668
6
4
9
9
7
8
2
1
7
3
5
8
9
3
1
2
6
5
8
7
6
2
Nikoli, the Japanese puzzle company that popularized Sudoku, requires all their puzzles to be created by hand — no computers.
Nikoli, the Japanese puzzle company that popularized Sudoku, requires all their puzzles to be created by hand — no computers.
There is a 'Sudoku variant' called Samurai Sudoku, consisting of five overlapping 9×9 grids sharing corner boxes.
There is a 'Sudoku variant' called Samurai Sudoku, consisting of five overlapping 9×9 grids sharing corner boxes.