Printable Hard Sudoku

Set 13ptiy4. 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
7 6 3
4 9 6 7
5 4 2
9 8 2
7 2 4 6 5 8
1
3 9 8
1 6 8 5
5 3
Hard #2
4
5 1 7 6
6 3 5 8
6 3 7 5 2 9
2 8 4
4
4 1 6
9 7 4 8
5 2 9
Hard #3
4 3 9 2 6
7
6 8 9 3
3 8 6
9 1 8
8 7 6 5
2 4 7
4 7 5 9
9 4
Hard #4
4 9 7 6
6 7 5 2 4
1 6
6 8 2
3 2 5
2 8 1
9 8 3
2 7 5
6 9 1
Hard #5
9 3 7
4 6
7 1 5 9
4 3 8
1 3 6 7 4
2 6 7 1
9 3 5
9 7
3 8 2
Hard #6
6 7 2 3
1
5
1 2
3 9 1 6
7 2 9
8 6 5 7
4 2 6 8 7
1 6 3 9 4
Hard #7
2 3
9 2 7 6
3 4
8 1 2 4
8 9 2 6
6 2 8
3 1 6 5
6 1 8
2 9 3
Hard #8
3 1 2 8 6
4 5 8
8 1 9 2
6 8
3 9 7
5
4 3 6 2 1
8 1 7
7 6 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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