Printable Hard Sudoku

Set 1sq1oup. 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
5 1
7 4 1
8 2 3 7 6
1
7 4 6
5 1 6 9 8
8 2 3
3 1 7 8
5 1 9
Hard #2
8 1 6
9 2 8
5 3
4 5 6 3
3 8 1 2 9
6 5 4
4 3 1
1 4
9 2 3 5
Hard #3
1 7 6 5
6 3 5 2 1 7
5 3
8 3 6 2 4
6 5 7 3 1
1 4 8
1 4
8 3
Hard #4
5 1 8 3
3 8 5 6 9 4
2 3 7 5
4
5 8 2 7
3 4 9
3 7 5 1
6 9 8
Hard #5
6 9 5 2 4 7
1
9 3
2 8 1 9
7 8 6 3
6 1 4 8
1
3 5 9
1 8 4 7
Hard #6
6
1 5 7 4
2 3
5 3 8
2 8 1 7
6 9 3
2 9 7 3
3 8 2
7 1 3 6 8
Hard #7
1 7
9 5 7 2
3 9
2 9 6 8 5
2 9 7 3
7 6
3 7 1 5
3
6 2 5 4 7
Hard #8
5 1 3 7 2
3 1 5
8 5 4 2
2 5 1
1 4
1 3 9 2
5 4 8 6
9 8 4 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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