Printable Hard Sudoku

Set nyhb0t. 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
8 1 3 4 7
5 3 9 2
7 8 1 5
3 7 5
2 9 4
7 2 6 3
4 5
1
7 3 6
Hard #2
7 2
4 8 9 1
1 4
5 9 3
2 7 3 8
5 3 7
1 5 4 8
7 2 3
3 1 6 7
Hard #3
3 4 1 8
6 1 4 5
4
8 2
1 7 8 9 3
6 2 7
5 2 9 8
9 8 3 7 6 1
Hard #4
9 3 7
2 6 5
4 1 7 8 9 6
7 4 1
7 8 2 4
4 9 3
5 3 6 7
2 8
4
Hard #5
7 2
1 2
2 8 6 3 5 1
7 5
7 5 8 6
6 1 4
4 3 2 5
3 7
7 6 3 9
Hard #6
2 9
3 9 6
7 6 5 4 3
7 1
4 1 8
6 5 3 7 4
8 3
2 5 1 4 8
7 2
Hard #7
5 1 9
5 6
2 7
7 5 2
2 9 4
3 7 9 8 5
5 8
4 1 3 2
9 7 4 1 5
Hard #8
3
4 7 8
5 6 1 9 7
8 1 3 2
2 6 4 5
9 6
3 5
1 7 2 5
3 9 1 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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