Printable Hard Sudoku

Set 1ir9a51. 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
4 5 7
9
8 6 7 1 5
1 5 4
2 8 3 1
6 7
4 9 2 8 3
8 7 4
3 4 7
Hard #2
4 2
1 5 2 4
2 7 5
9 2 1
3 2 4 8 5
7 1 2 4
1 3 7
8 1 5
7 9
Hard #3
8 7 2 9
4 9 3
5 7
6 2 4
6 9 8 2
2 3 1
3 1
8 7 6 4
5 6 3 9
Hard #4
8 2 7 6 5
7 9
5 4 3
7 1 9
2 9 5
1 7 6
2 1 3 6 4
3 7 2
9 5
Hard #5
9 3 6 4
6 4 8
2 1 5
3 2 4
9 2 5
4 5 1 7 6
4 1 7
2 4 6 9
5
Hard #6
1 7 5 6
9 4 6 7 2
6 9 1
3
2 5 3 1 8
6 8 5
7 5 1
6 2 5
9 8
Hard #7
5 1 6 2
8 9 3 5
9 7 4
7 6
5 3 9 4 1
1 6
5 4 8 3
4
7 8 6 9
Hard #8
2 8 7 1
4 9 2 6
3 1 6 7 9
7 6
3 2
3 1 8
1 8 5 3
6 8 2
4 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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