Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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