Printable Hard Sudoku

Set 1qnra91. 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 3
3 6 2 1 9
5 8 2
9 2
6 5 2 8
4 6 8 1
5 1 8 6
1 3 4 6 7
Hard #2
7 5 8
5 3 2 6
8 6 1
9 8
3 6 7 1
1 8 7 3
7 3
7 6 9 5
3 9 4
Hard #3
4 6 2 7
7 3 8 9
4
3 4 5
8 7 6 2
2 1 5
2 8
4 9 6 3
1 5 4 7
Hard #4
5 7 1
1 2 9 5
9 5 2 1
5 7 8
3 6
2 8 6 3
8 5 6
1 5
9 2 3 1
Hard #5
7 4 5
1 3 4 9 7
9 8 6 3
9 5 2
6 8 9
7 8 1
5 9 3
1
9 2 8 4
Hard #6
2 7 3
2
3 5 7
6 1 8
4 6 7
5 1 4 2
3 8 1
4 2 3 6 8
1 6 4 7
Hard #7
1 7 6
7 8 6 5
9 2 4
4 1 6 7 2
9 1 8
6 5 4
6
3 9
1 3 5 8 7
Hard #8
9
1 4 9 6 8
3 2 1
8 9 7
2 5 7 4
9 1 3
1 5
5 4 1 2
6 5 3 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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