Printable Hard Sudoku

Set m89mu3. 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 9 8 6
4
9 2 5 3
3 9 1
1 4
9 4 6 3 2
6 5 7
4 8 3 5
7 2 1
Hard #2
6 1 4 2
6 8
5 1 2 4
1 3 6
6 8 2 5
9 7 5 1
3 2 4
9 8
3 9 5
Hard #3
1 6 8 3
2 6 4 1
7 4
5 2
9 2 1 7
7 9 3
4 3 2 7 6
9 8 1 3
9
Hard #4
3 7 2 5 1
9
4 3
7 1 3 6 4
7 1 6 2
5
6 8 9 2
8 9 2 4
1 7 8
Hard #5
5 4 6 1
9 7 1 2 6
6 2
5 1
1 3 9 5
4 9 2
8 9 3
4 8 5 6
4 7
Hard #6
3 4 8
6 2 1 5
7 9
2 5 9
5
4 9 5 6 1
3 9 7
5 7 2 6
8 6 4 1
Hard #7
2 8 7 9 3 5
5 1
6 9 5 8 4
7 2
1 5 9 6
6 5 9
2 7 6
5 4
6 3
Hard #8
3 7 6 4 9
7 5 3
1 6 8 9
2 5
8 4 2
9 5 4
1 2
8 3 2 1
8 6 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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