Printable Hard Sudoku

Set ols195. 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 9 3
1 4 8
8 6
8 6 9 4 7
5 6 1
3 7 8 5
6
7 3 5 6
9 7 2
Hard #2
4 7 8
9 5
4 3 6 5
1
1 6 5
5 6 2 4
7
9 4 1 5 8 6
1 2 7 5 3
Hard #3
5 2 9
3 6 5
3 2 1
3 7 8 9
9 7
7 4 6
2
5 6 1 9
9 8 3 7 1 5
Hard #4
9 2
2 3 4 6
5 6 1 7
3 2
9 6 5 4 8
1 2 6
6 8 3
5 8 3 4
1 6
Hard #5
8
5 6 2 9
1 9 3 6 4 7
2 1 9 5
2 4 7
4 1 3
9 7
3 5
4 8 3 2
Hard #6
4 2 9
2 7 1
6 3 8
9 1 3 2
5 6 4
4 3 9 5
7 9 5 6 4
4 6
3 8
Hard #7
4 1 8
9 2 7
3 6 5 9
6 4 5 1
7
9 2 6 4 8 3
4
2 9
5 2 4 1 9
Hard #8
3 5 4 6 1
1 6
7 2 8
2 4 9
2 9 7
8 1 3 4
3 7 9 4 5
2 6
9 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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