Printable Hard Sudoku

Set s20qcf. 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
9 3 7
7 8 6
8 1 5
7 2 5 6
1 8
4 5 3 2 7
6 8 1 4 5
8 4 9 6
Hard #2
4 9
8 6 2
7 1 4
4 5 2
6 9 4
7 1 5 3 6
4 5 6
5 4 1
3 6 8 7
Hard #3
6 1 9
2 4 8 3
9 4 8
2 3
4 8 3 9
9 6 8
8 4 7 5
6 2
5 7 2 6
Hard #4
6 7 2 1 5
3 2 5 7
6 4
2 1 6
6 3 5
2 4 7
3 8
4 5 6 1 2
9 5
Hard #5
9 2 3
1 6 8
4 7 9 2 6
7 9 2
6 7
3 2 8 5
7 5 2 4
4 7 8
2 1
Hard #6
1 3 2 7
8
5 7 4 1
8 7 5
3 5 6
1 3 5 4 8
4 6 1
5 1
6 4 5 3
Hard #7
5 9 3 8
1 4 6
8 6 5
8 1 3 2
2 5
4 5
7 2 9
2 6 8
4 6 2 1 5
Hard #8
1 6 4
9 7
3 2 7 9 1
7 8 6 2 4
5
6 4 3
4 2 7 9
1 2
7 4 3 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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