Printable Hard Sudoku

Set 1d01n5o. 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 9
2 6 3
4 9 2 8
6 8 1
8 9 4 1 6
3 7
2 6 5
7 5 3
4 1 9 6
Hard #2
8 3 4 9
1 5 3 8
9 2 1
8 5 6
7 3 2
7 4
3 2 1
9 1 3 5
1 4 8
Hard #3
5 9
4 5 3 2
9 2 7
1 3
5 8 3 9
2 6 7 1
5 6 4 2
2 9 1 8
6 1
Hard #4
4 8 1 5 6
2 1 7
8 6 9
7 9
2 7 4
9 6 3 8
8 6 2
3 6 5
9 1 4
Hard #5
6 9 8
5 7
3 9 8 5 4
6 7
3 4 1 6
8 2 3
5 9 2 3
9 3
3 7 8 6
Hard #6
5 9 8
6 1 2 7 5
7 5 8 4 6 3 1
6 5
3 7
2 4
1 2 8 5
1 8
4 6
Hard #7
8 2
1 7 5 9 4
6 4 8
2 1 5 3 7
4 2 5
7 3 5 4
7
2 3 7 1
8 6
Hard #8
9 2 4
7 3 8
2 7 4 1
5 9 8
1 8 7 6 3
8 5 1 7
3 1
7
2 4 6 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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