Printable Hard Sudoku

Set dm66t0. 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
7 3 5
3 4 2
4 8 1 3 7
3 7 6
8 4 2
6 9 7
3 5 4
8 4 2 5
6 3
Hard #2
7 4 6 3
6 5 1
1 3 9
5
3 1 2
8 6 1 3 2
6 4 2
1 8 9 7 4
8 6
Hard #3
2 6
8 3 6 4
3 7
5
1 5 8 3
9 5 6 2
4 3 2 5 8 1
1 6 3
5 7 4
Hard #4
8 2 5 1
9 3 6 2 4 8
7 2 1
1 8 9
4 6 7 1
3
6 9
5 1 2
3 8 5
Hard #5
7 6 4 5
2 5 8 6
2 7
4 9
3 4
9 3 1 6 7
1 4
3 6 2
6 8 7 1 5
Hard #6
9 2 5 3
1 2 7 9 4
1 2
2 6 4 9
3 9 6
8 5 9
6 4 1
3
4 2 1 7
Hard #7
2
4 7 3 8
4 2 7 1
5 7 6 8
8 1 5 2
8 4 5
3 5 1 4
8 9 3
2 4
Hard #8
9 8
8 6 1
2 1 7
7 6 3 4
7 8 2 9
5 1 4 6
3 7
1 6 5
2 4 7 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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