Printable Hard Sudoku

Set 1k6hy6r. 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
9 8 6 1
5 3 6 7 2
7 9
9 4
4 5 7 8
6 1 5
1 3 5 2
1 8 9
8 3
Hard #2
4 8 1 6 7
6 9 7 3 1
3 4
8 3 4 2
2 5 7 4
7
2 9 6
7 6 8
4 3
Hard #3
7 8
1 5 6 4 8
8 1 7 3 9
4 2 5
1 9
8 7 3
8 6 2 4
9 1 6
8 7
Hard #4
5 4 3 2 7
8 4
3 8 7 1
1 4
1 7 6
7 3 5 4 9
2 6 7
7 9 3
9 5
Hard #5
7 9 8
8 4 2
2 5 1
8 7 4 1
3 6
3 9 8 1 7
2 4 6 1
3 1
6 9 3
Hard #6
5 8
6 8 9 5
5 3
4 9 2
1 7 3
7 2 8 5 4 6
7 1 3
1 7 3 5
6 7
Hard #7
5 4 3
6 1
7 3 4 6
5 7
4 2
2 1 5 9 4
2 5 7 6 1
4 1
1 5 8 2
Hard #8
4 6 2 3
9
6 3 7 9 4
6 2 3 8
7
8 6 4 5
1 9 6 3
7 4 6
4 5 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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