Printable Hard Sudoku

Set 1x1kdow. 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
5 2 7
2 1
7 2 8 1
9 3 2
6 9 2 3 5
5 8 7 9
2 3
8 6
5 4 1 2
Hard #2
1 7 2 6
8 1 9
3 7 2
6 8 7 5 9
4 6
5 7 6 1
1 3 9 5 8
1 5
6
Hard #3
7 9 5
1 8 7
2 3 5
3 9 4 5
5 2
4 5 7 8 9 3
4
9 8 4 6 7
7 8
Hard #4
9 3
4 1 5 2
7 6 5
6 9 8
7 1 3 9 4
9 7 5
2 7
6 4 8
6 3 4 7
Hard #5
1 9 3 8 6
5 4
8
8 2 5 3
7 4 2
6 1 5
9 4 6 7
2 7 9
4 9 5 3
Hard #6
7
8 6 5 3
1 9 3 2 6
1 7 4
3 9
2 1 4 9
1 4 6
2 8 1 3
6 8 4
Hard #7
4 9 6
5 6 3
3 2 1
3 5
6 1
1 7 9
1 3 5 2 8 6
4 8 6
2 9 1 8
Hard #8
3 6 8
9 3
6 8 1 5 3
3 2 8 9
9 1 6
1 4 3
7 2 6 9
4 1 3
5 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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