Printable Hard Sudoku

Set t0c4c9. 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 9 3
2 5 9 1
5 7 1 6
8 3 6
9 1 4 6 7
8 9
5 8 3 1
3 7 2
7
Hard #2
9 2 3
3 5 4 6 2
7 6 5
1 3
4
4 1 3 7 9 5
7 2
6 4 2 8
8 9 6
Hard #3
3 1
8 6 2
2 9 3 5
2 8 3
4 6 9
9 1 3 2
1 2 6 9
4 1 3
1 7 5
Hard #4
9 7 6
7 3
2 3 8 4
9 8
4 6
7 3 9 5
2 6 4 3 5 9
5 8 4
5 3 2
Hard #5
6 7 9 8
7 8 6
2 5 3 7
3 9 4
7
9 2 1 6
6 2
9 5 1 4
4 8 3 9
Hard #6
9 2 6
8 2 4 9
3 2 4 5
5 8
8 2 3
1 9 5
9 8 3
4 7 6 2
9 1 7
Hard #7
1 8 2 3
9 7 4 5
8 6 4
2
8 3 2 5
7 2 9 6
5
2 8 3 7
6 4 1 9
Hard #8
5
6 3 5
4 5 2
1 7 3
8 4 9 6 1
6 7 9 4
4 9 8
7 8 4 3
1 4 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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