Printable Hard Sudoku

Set r06b0f. 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
3 1
9 1 2 6 7
6 8 1 4
8 1 2 6 5
3
4 6 7 1
2 4 8 9
9 1 8
4
Hard #2
6 2 9 7
8
7 6 1 5
7 5 9 6
3 5 9
9 6 1
1 7 8 4
9 4 7 3
5 7
Hard #3
2 9 4
6 1 3 8
8 9 4 2
3 4 9 6
9 6 5 2
8 7
4 7
3
8 5 4 6 1
Hard #4
7 3 8 4 1
8 6
9 7
2 9 7
1 9 4
8 2 4 5
1 7 8 3 9
4 3 7
2 5
Hard #5
7 3 9
4 6 5 1 9
8 1 2
1 8
9 3 4 7
6 9
6 5 9
5 9 8
7 5 3 2
Hard #6
1 5 8
7 3
1 4 2 5
9 8 2 7
5 4 3
8 3 1 6 2
9 7 4
3 1 5
5 2
Hard #7
2 6 8 7
1 3 2
3 2 6 8
3 9 2
8 1 3 5
4 8 9
6 3 5
2 4
5 4 1
Hard #8
4 7 6 8
2 3
5 4 2
2 5
8 4 9 7
6 3 2 4
8 3
5 9 4 7
4 6 7 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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