Printable Hard Sudoku

Set 15oku95. 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 8 9 6
8 5 6 3 9
2 4 8
7 6 3 5
2 9 7
1 6 8
1 7 4
6 7 5
5
Hard #2
2 3
7 9 1 8 2
5 6
8 9 2 5
6 1 4
3 5 9 6
7 5 8 6 3
7
6 8 1
Hard #3
8 9 3
9 5 8 2
1 6 8
2 6 8
5 2 7 3
9 3 8 7 2
3 1
4 7 5
5 7
Hard #4
1 6 8 3
3 5
9 1 7
2 3 6 7
7 1 4 8
3 4 2
3 7 5
2 8 9
9 3 6
Hard #5
9 3 7
1 2
3 2 4 9
3 5 6
4 6 5 7
4 6 9 2 1 8
7 4 9
9 1
6 1
Hard #6
6 7
8 5 7 9
7 4 1 2
5 1 3 7
8 6 9 2
2 3 4 6
8 5
4 1 3 9
2
Hard #7
3
4 8 3 1 6
5 2 9
5 7
8 4
4 1 9
7 6 5 4 9 8
2 9 3 6 8
5 4
Hard #8
6 7
8 1
2 9 6 5
8 5 3 6 9
9 5 8 2
4 1 9 6 8
7 8 1 2
5
1 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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