Printable Hard Sudoku

Set 1hkrl1z. 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 9 2
4 8 7 6
1 3 6 4 8
4 6 9
6 8 1
5 3 7 6
7 1 2
3 2 1
9
Hard #2
9 7 4 3
4 7 6 5
4 6 5
9 1 5 3
2 9 6
7
2 8 6
3 8 7 5
4 7 9
Hard #3
3 8 4
5 6 9
6 3 7
2 4 6 3 7 1
1 4 8
7 5
4 5 1 6
6 7 9
5 2
Hard #4
3 7
6 2 1 4
9 4 5
8 1 2
9 7 3 5
4 9 7
4 3
1 5 4 2
9 8 6 7
Hard #5
3 8 1
7 2 1 5
3 9
7 5 2
1 4
4 9 5
6 5 1 2 3 8
9
3 4 1 5 2
Hard #6
5 7
8 4 9 1
9 3 8 5
4 6 2 9 5
2 8 3
8 5 6
7 5 6
1 2
8 3 2
Hard #7
8 2
8 3 9
9 5 7
4 2 7 3
9 3 6 4
3 9 5
1 4 8
3 5 8 1
1 5 2
Hard #8
2 5 3
6 8 2 9 1
1 7 8 2
7
4 6 7 5
1 9 4
2 9
8 1 3
7 4 6 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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