Printable Hard Sudoku

Set olk4t0. 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
1 2 8 4 5
5 6 8 1
3 9 7
9 1 7
8 4
4 9 3
3 6
9 6 4 7 5
4 5
Hard #2
5 3 1 8
4 9 6 7
1 9 6 8 3
5 3
6 8 4
7 5 9
3 8 6
4 9 3
8 1
Hard #3
1 5 2 9
5 9 3 8 4
4 1
8 4 7 5 6
3
8
5 7
2 3 8
8 6 2 4 9 7
Hard #4
4 2
3 8 1
1 7 8
7 9 2 4 1
3 5 6
1 2
5 3
3 2 4
8 2 3 6 7 9
Hard #5
1
6 4 3 9
5 9 2 6 3
6 7 2
7 1 3
5 2 4
3 2 5
9 2 1 3 6
8 2
Hard #6
6 3 2
3 7
8 5 4 9
4
6 1 8 4 7
9 2 5 3
6 2 5
9 8 4 6 1
4 3
Hard #7
3 4 6 5
5 1 7 9
2 6
9 6 3 4
1 4 6
2 7
2 7 3
5 2 1 8
8 4 3
Hard #8
7 4 5
7 2 9
5 3 6
3 2
4 2 6 1 5
1 7
1 6 7 5 3
4 3
8 2 1 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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