PlaySudoku.us
Medium · Puzzle #638
9
7
8
4
3
5
1
9
7
5
2
1
4
1
5
9
2
6
4
3
7
4
6
5
8
3
2
3
1
8
5
2
9
6
4
There are Sudoku apps that generate over 1 billion distinct puzzles — you could solve a new one every day for 2.7 million years.
There are Sudoku apps that generate over 1 billion distinct puzzles — you could solve a new one every day for 2.7 million years.
"The hardest game to win is a won game." — Emanuel Lasker
"The hardest game to win is a won game." — Emanuel Lasker