Printable Hard Sudoku

Set 17b09ih. 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
3 7 1 2
9 1 6 7
2 8
2 9 4
4 5 9 7
7 6 3 4
6 3
8
4 7 2 5 6
Hard #2
9 2
8 9 7
1 2 5 9
8 5 1 4
1 3 8
4 8 5
3 2
9 5
2 8 9 1 5 3
Hard #3
7 9 2 8 5
3 1
3 7 2 9
6 7 3
4 5
7 3 8
2 7 3 1 4 9
9 4 5 7
Hard #4
4 1 2
3 8 2 6
2 6 1 8 5
2 8 4 6
5 2 7
7 9 8 1
8 5
2 5 3
3
Hard #5
5 4 8
7 1 6 5 2
2 8 6
7 5 4
3 8 9
4 1 6 5
6 5 3
8 7 4 6
5
Hard #6
2 6 4 7 1
8 3 5
6 8 4
4 8 9 5
3 7 9
7 5
8 7 4
4 5 6 3
4 1
Hard #7
1 2
1 9
8 6 4 3
4 9 6 1 2 3 5
4 2 6
3 1
7 4
2 6 3
5 3 1 9
Hard #8
6 4
8 7
7 3 9 1
9 6
2 3 8
3 7 9 6 4
4 6 7 2
5 7 2 3
4 5 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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