Printable Hard Sudoku

Set qcchb0. 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
2 9 1
6 7
1 4 2 8
7 9 3
1 8 3 5
5 6 2
3 9 4 8 7
8 7 9 1
1
Hard #2
8 9 5 4
5 8
4 6 8 1 7
7 1
4 6 2
2 9 7
4
1 4 9 3
9 8 3 5 2
Hard #3
3 6 9
9 4
7 3 5
6 1
1 9 6 4 2
3 4 9 8 7 6
7 8
4 1 3 5
2 3
Hard #4
3 2
8 9 4
2 6 7 5
8 2 3 6
6 7 4 8
2 6
1 9 5 3 2
3 5
1 6 9
Hard #5
2 5
8 9 3 5 2
1 9 8
2 7 9 5
8 9 4
6 7 2
2 5 9
2 5 7
6 4 8
Hard #6
7 3 1
9 5 8 1 7
6 5 4 8
4 1
4 3 2
7 9 8 3
7 2
1 4 9
4 2 6
Hard #7
7 3 5
3 8 2 4
4 5 1
3 5 1
2 3
7 4 3
5 7
2 6 9 8 1
1 7 8 6
Hard #8
4 9
8 1
1 2 5 3
8 3 2 9
3 5 7 6 4
4
7 6 4
6 4 7 8 5
8 9 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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