Printable Hard Sudoku

Set s5qq5b. 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
2 3 9 4 6
6 8 5 7 3
4 5
1 2 8 3
1
9 7 2 6
5 1 4 6
4 7 9 3
Hard #2
5 9 4 7
3 1
6 9 1
1 7 8
3 6 2 5 9
9 8 7
8 3
3 4 6 1
1 2 7
Hard #3
7 9
1 8 2 6
7 3 8 6 2
2
5 6 1
6 7 3 4 5
5 1 2
1 2
9 7 4 8
Hard #4
9 4 5 8 7
8 4 7
7 9 3
8 1 5
7 2
6
1 5 8 3
7 6 9 5
9 2 4 1
Hard #5
6 4 9 8 3 1
9 7 6 8
7 4 1 5
1 3 9
9 1
7 2
8 3 5 6 4
1 5 7
Hard #6
8 5 4
7 9
6 2 8
4 7 8 6
9 1 3 4
6 3 9 8 7
8 9
1 3
3 4 1 7
Hard #7
6 9 2 3
3 5 9
4 2 7 1 5
8 6 1 4
3 6
6 7 5
7 9 4 6
5 3
2 9
Hard #8
4 8
6 5 3 9 4
5 7 1 2 8
4 7 1
9 2
5 1
3 6 9 4
2 4 3
1 7 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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