Printable Hard Sudoku

Set 65qmt6. 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
4 6
8 2 1
2 5 7
7 2 6
3 9 1 2
3 4 9
2 4 8 3 5
9 7 1 4
1 6
Hard #2
2 9 3 8
5 7 6
3 4
4 3 7 2 1
8 6 5
5 4 2
2
9 1 7
6 5 1 8 9
Hard #3
3 1
9 2
1 6 8 3 2 7
3 6
1 3 5 4 2
1 6 5
2 8
3 1 4
7 9 3 6
Hard #4
7 8 1
7 5 3
1 6 2
6
1 3 4 7
2 5 9
1 7 6
4 2 8 5 9 6
5 9 1
Hard #5
1 5
1 3
9 2 6 8 4
1 4 8
8 3
5 8 1
9 5 1 6 8
4 7 5
2 6 9 4
Hard #6
1 3 5 8
5 6 4
7 2 6 1 5
4 6
8 3 7
5 9 6
4 2 5 9
2 5 8 6
6
Hard #7
5 7
2 7
6 1 5 2
4 2 3 8
7 6 8 2
4 5 6
6 1 5
2 3 1 9
9 8 3
Hard #8
2 3 8 4 1
9 1 7 2 5
5 1
2 6 5
9 4
5 8 4 7 6
3 9
3 6 2
1 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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