Printable Hard Sudoku

Set 1xl45pz. 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
9 2 6
6 9 1 7
2 4
6 7
1 4 5 8
2 6 7 1 9
8 5 9 4 3 1
6 1 8
Hard #2
9 2 3
5 1 8 3 4
8 6 9
6 9 7
4 5
3 1 8
4 7 2
1 6 3 7
7 5 9
Hard #3
4 2
8 1 5
1 7 6 9 2
2 3
9 4 6 7
4 8 1
4 3 2 5
5 3
1 9 4 6
Hard #4
7 3
6 5 9 1
4 7
2 6 3 1 5
5 8 9
7 3
1
8 7 1 9 6
3 6 2 4 8
Hard #5
6 9 2 7
4 6 5 8 3
8 7 5 1 6
5 1 3 2
4
2 5
5 8 6 3
3 9 2 5
Hard #6
2 6
7 5 9 4
1 3 7
4 6 8
3 7 4
9 2 5
9 4
2 8 5
4 7 1 9 2 6
Hard #7
6 5 2 1 3
8 3 9
1 7 6 8
3 4 6 8
8 1 4 7
3 9 5 1
5
6 5 4 9
Hard #8
5 7 6 2
1 8 3
4 1 2
5 4 3
2 5 9 6
7 9
6 9 5 1 8
8 1
3 1 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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