Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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