Printable Hard Sudoku

Set 1bkwa6c. 8 puzzles with an answer key, ready to print.

Hard puzzles start with about 29 givens and need real techniques: pointing pairs, naked pairs and hidden pairs. Paper is a great way to practice them, because you have to keep your own notes honest.

Each free PDF has 8 puzzles, four to a page on US Letter paper, plus an answer key with every solution. Every puzzle has exactly one solution. A new set appears here every day, or you can grab a different set any time.

Puzzles in this set

Hard #1
7 4 2
9 2 7
6 1
6 2 9
5 6 1 3 2
1 8 3 9
2 3 5
8 6 4
9 8 4
Hard #2
6 1 5
2 5 8 4
9 8
7 2
4 5 6 7
4 9
3 4 2
4 7 8 5 6
7 2 9 8
Hard #3
3 2 4
9 6 8 5
4 2 8 9
9 1 6 2
6 4 3
1 9 7
5 3 8 1
7
7 3 1
Hard #4
8 7 6
4 7
2 8 3 5
1 7 5 4 8
6
9 6 2
3 7
1 4 9 2
5 4 1 2 6
Hard #5
4 3
8 7 2
2 6 3 5 1
4 5 9 7
2 5 1
1 7 6
1 4 5
7 9 4
6 5 2
Hard #6
1 2 7 8
2
9 6 3 2 7
4
6 4 7 9 3
7 2 8 5 6
3
1 9 3 5 4
5 7
Hard #7
3 9
2 3 8
9 8 4 1
8 6 5
2 4 5 9
1 7 6
3 1 7 8 6 4 9
1 8
3
Hard #8
7 9
7 8 3
6 4 5 7
9
3 7 4 1 5
2 6 7
3 5 9
5 9 2 1 4
1 7 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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