PlaySudoku.us
Hard · Puzzle #242
4
7
2
8
9
5
9
3
7
6
5
4
1
9
4
6
8
3
2
6
4
3
8
5
6
7
3
"Candidates must be mentally prepared for every new game as if it were the last." — Mikhail Botvinnik
"Candidates must be mentally prepared for every new game as if it were the last." — Mikhail Botvinnik
SAT solvers — used in chip design verification — can crack any Sudoku puzzle in milliseconds.
SAT solvers — used in chip design verification — can crack any Sudoku puzzle in milliseconds.