Expert Sudoku Puzzles
4 expert puzzles. 17-21 clues each. Maximum difficulty.
Puzzle 1: Expert
3
8
5
1
2
5
7
4
1
9
5
7
3
2
1
4
9
Puzzle 2: Expert
5
1
7
3
4
7
9
6
3
2
7
9
5
4
3
6
2
Puzzle 3: Expert
7
3
9
5
6
9
2
8
5
4
9
2
7
6
5
8
4
Puzzle 4: Expert
9
5
2
7
8
2
4
1
7
6
2
4
9
8
7
1
6
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