Hard Sudoku Puzzles
4 hard puzzles. 20-26 clues each. Not for beginners.
Puzzle 1: Hard
6
4
7
3
6
9
1
8
5
1
8
3
3
6
4
5
4
2
6
9
3
2
1
Puzzle 2: Hard
8
6
9
5
8
2
3
1
7
3
1
5
5
8
6
7
6
4
8
2
5
4
3
Puzzle 3: Hard
1
8
2
7
1
4
5
3
9
5
3
7
7
1
8
9
8
6
1
4
7
6
5
Puzzle 4: Hard
3
1
4
9
3
6
7
5
2
7
5
9
9
3
1
2
1
8
3
6
9
8
7
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