Printable Hard Sudoku

Set gknzj2. 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
6 5 8 1
2 6 4
1 5
9 5 8
1 3 6
9 3 6 2
4 5 7
6 2 1
2 1 7 3
Hard #2
5 7 6
9 1
2 9 4 7
7
7 3 2 5
6 5 4 1 8
4 5 3 2 1
3 1 4
5 8
Hard #3
5 9 3 2
7 4 3 8
9 5
3 1 5 9
2 5 8 6 4 3
2 8
7 9
7 3
5 4 6
Hard #4
3 5 7
2 7 8
9 5
8
5 4 6
6 7 9 4
7 2 4 1 5
6 9 2 7
5 6 8 9
Hard #5
8 4 1
2 7 8
1 4 9
5 2 9 1 7
9 3 6
9 6 3 2 5
4 2
2 8 5
3 7
Hard #6
8 1 9 5
7 6
5 6 8
2 9
4 6 3 2
1 4 7
2 6 9 3
3 8
8 9 7 5 1
Hard #7
9 6 3
1 3 9 2
5 6 1 8
7 4 3 2
9 2 7 1
5 8 6 7
7 1
8 6
9 3
Hard #8
9 3 4 1
6 9
3 7 4
7 1 5 9
4 1 5 3
3 2 8
2 4
2 9 6
4 7 2 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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