Printable Hard Sudoku

Set 17kwytm. 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
1 4 3
2 5 6
1 9 8
1 6 9 4
6
8 1 3 7 2
2 9 7
6 7 8
5 9 3 4
Hard #2
9 8
4 8 1
8 5 4 2 7
2 5 4
2 7
7 1 4 3 6
9 6 7
9 1 3 2
6 8
Hard #3
4 3 5
6 5 2 7 4
7 9 2
8 7
5 3
6 5 9
9 7 3 6
1 2 4 9 3
5 4
Hard #4
2 7 4 6
4 5 3 2
3 5 9
6 2 3
6 7 1 9
5 1 4
3 5 6
7 8 4 5
1
Hard #5
1 6 4 8
8 9
8 3 9 7
7 9 8 3
8 3 2
4 7 5 2 9
1 7
3 4 2
2 5
Hard #6
9 5 3
1 2 8 6
2 4 8 1
1 3 5
5 8 1
8 6
7 9
2 7 1 9 8
6 3 2
Hard #7
3 2 6 7
5 9 8 7 4
8 6
4 7 2
6 1 9 8
9
8 4 3 5 6
3 9
1 5 7
Hard #8
8 9 2
8 4 5 3
3 4 9
3 6 5
8 2 3 9
4 6
9
6 4 2 1
5 2 1 7 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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