PlaySudoku.us
Expert · Puzzle #481
4
5
2
3
9
4
5
8
7
8
7
5
7
9
3
5
1
6
8
9
1
2
1
6
8
4
"A theory that is not refutable by any conceivable event is non-scientific." — Karl Popper
"A theory that is not refutable by any conceivable event is non-scientific." — Karl Popper
There are Sudoku variants with extra constraints: Killer Sudoku (cage sums), Diagonal Sudoku, and even 3D Sudoku.
There are Sudoku variants with extra constraints: Killer Sudoku (cage sums), Diagonal Sudoku, and even 3D Sudoku.