Printable Hard Sudoku

Set 191915p. 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 4 8 7 2
2 8 9
8
6 4 9 2
7 9 5 6
1 8 7
7 4 6 2 3
6 5 1
Hard #2
5 1 3
9 5
7 8 3 2
8 5 2 7 4
4 5 1 7 9
8
3
9 2 4 7
6 5 4 8
Hard #3
8 6
2 1 4 3
7 1 8 9
6 5 1 7
8 4 3
2 9
9 6 8 5
4 6 7
4 8 2
Hard #4
4 8
3 8 2 7
5 1 4
9 2 6 8
3 6 5
8 2 3 6
3 4 7 5
8 5 9 6
6
Hard #5
3 6
6 7 9 8
4 5 6 2
5 7
6 8 1 3
7 9 5
9 8 2
3 7 4 2
2 9 7
Hard #6
7 1 5 2 3
3 9
4 6 3 7
8 3 6 7
1 5 3
9 4
6 2 4 7
9 8 1
5 2
Hard #7
5 7
1 2 5 6
6 8
7
9 4 3 5 7
7 2 8 3
5 4 9 6
6 3 9 7
4 5 7
Hard #8
3 2 7
1 5 2 4
5 6
2 3 6
1 9 5
1 8 9
5 7 6 2 4 1
3
2 5 6 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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