Printable Hard Sudoku

Set 6w1p13. 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 2 8 9 1
9 5 7
8 6 9 5
3 1 7 5 4
9
4 8
7
7 8 1 4 2
3 4 2
Hard #2
9 8
1 5 7 2
3 2 1
1 4 8 6 5 7
7 4 3
6 3 7
7 1 9
5 6
2 3 4
Hard #3
5 8 3
9 1 3 8
6 9 1 5
8 1 5
5 7 9 8 6
6 7 3 8
7 1
3 7
4 5
Hard #4
6 1
5
2 8 1 5
8 1 6 3 2
3 2 8
7 8
3 5 6 1
8 9 2 7 3
4 7 9
Hard #5
3 5 6 1
5
4 9
1 9 2 6 4
4 3 5
7 1 2
6 8 9 4 1
7 9
2 6 3 7
Hard #6
9 6
4 3
5 4
6 5 9 3 2
9 7
3 7 8 1
5 1 3
7 3 8 2 1
1 5 4 2
Hard #7
6 7 8
1 5 2
9 1 6
1 4 2 3
2 4 9 7 6
6
4 9
3 9 1 2
2 5 8 6
Hard #8
9 5 2
7 4 1 8 2
4 6
7 9
2 6 4
3 8 6
1 3 8 9 4
1 8
5 9 3 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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