Printable Hard Sudoku

Set 1wlghj5. 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 7 9
3
1 5 3 7 9 2
7 2 6
4 9
3 5 8
2 4 8 3
1 2 5
9 7 6 4
Hard #2
3 8
4 1 6
6 4 1
7 6 4 3
9 7
6 9 5 1
1 7 4 8 2
8 3 2 5 9
2
Hard #3
8 2 1
4 5
4 6 3
7 5 6 1 4
1
3 1 7 4
1 3 8
9 5 3 7
3 6 2 4
Hard #4
6 3 7
5 3
5 2 1 9
4 6 7 8
9 1 6
4 5
9 7 2 1
6 1 3
4 6 1 9
Hard #5
3 5 7 2
1 8 4
8 3 1
6 1 7
8 5 3
1 8 4
3 7 9 5
4 6
1 9 3 8
Hard #6
5 4
7 9
1 6 9 8 2 7 5
8 1 4
9 3
2 3 9
7 9 2 6 4
4 8
2 4 5
Hard #7
3 2 6 8
5 2
6 8 1 3
3 2 5
8 1
2 9 4 6
1 4 9 2 6 8
5 9 8
3
Hard #8
2 5 9
5 3 2
6 9 7
5 9 1 7 8 6
4 7
7 9 2 5
6 8
3 9 4
4 6 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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