Printable Hard Sudoku

Set 5xqm25. 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 1 7 3
1 9 5
6
6 8 3
7 1 2
8 5 2 7
1 7 2 6
4 2 9 8
1 8 4
Hard #2
2 8 4 1
6 2
1 8 6 7
1 7 3 8
2 8 3
5 1 4
3 5 2 8 1
6 9
2 4
Hard #3
2 6 3 4
5 3 2 1
2 5 9
1 4 9 6 3
2 9 8 1 6
8
3 8 7
5 6
4 1
Hard #4
5 4 7 3
6 2 4 8 7
8 9 6 3 1
3 5
4
8 5 3 7 6
7
9 6 8
4 2 1
Hard #5
1 7 8 6 4
6 1 8
9 5 3
8 7 5
4 1 7 8
6 9 2 7 1
1 4 2
2
6 9
Hard #6
8 3 9 2
3 7
7 6 4
3 2 7 5 4
6 4 2
5 7 3 9
1
1 2 3 7
6 1 3
Hard #7
4 6 8 3
3 6
7 5 6
9 7 2
2 3 6 1 7
3 9 5
6 4 9
8 6 5
4 2 3
Hard #8
8 1 3
8 6
2 3 5 4
4 8
6 7 2
5 9 1
3 7 2 6
9 6 8 1
2 4 7 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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