Printable Hard Sudoku

Set uwi1qv. 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
8 5 6
6 5 2
9 7 8 3
3 1 7
5 6 8
8 3 9
1 8 6 4
9 7 2 3 1
9
Hard #2
5 2
7 8 9 6
4 3 7
1 8 9
4 9 1 8
8 9 5 4 7
2 4
5
7 8 1 3 2
Hard #3
2 5 8 4 9
3 2
6 9 1
8 9 7 4 2
1 3
2 6 7 1
2 5
1 5 6
8 4 6
Hard #4
3 1 6
8 4 7
1 5 4 2
3 6
7 9 4
1 2
7 9 6 8 3
3 2 7 1
5 4 9
Hard #5
7 9 6 4 1
9
4 5 8 7
4 3
2 8 1
5 7 6
8 6 4 3
9 5 2 6
8 2 4
Hard #6
1 3
9 6 2 7 1
6 3 1 9 8
8 6 2 5
7
2 8 4 6 7
1 2
5 7
3 6 4
Hard #7
5 9
1 7 9 6 8
9 2 1 3
2 3 8 7
8 6 2
9
8 5 2 9 7
1 8 5
3 8
Hard #8
3 7 6 5
6 1 3
4 5 7 2
8 2 3
5 9 3 8 4
1 7 2 6
4 3 9
3 1 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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