Printable Hard Sudoku

Set a6w3yz. 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
6 3 1 8
8 1 3
6 2 4 9
2 1 8 7 5
9 8
4 2
7 3
8 6 7 4
2 1 3
Hard #2
7
1 9 5 3
3 4 8 9 5
1 9 4
5 9 7 3
7 8
2 6 3 1
3 9
7 8 1 2
Hard #3
5 6 3 9
2
1 4 8 6
6 8 7 2
1 9 8
4 3 7 5
5 8 3
7 9
8 6 1 5
Hard #4
9 1 7
7 5 8 4 3
5
1 9 4 2 6
9 8 6 4
6 3 8 2
9 5
1 3 8
2 7
Hard #5
8 4 3 7
3 2 6 5 1
9 6
6 4 7
8 5 7 1 2
9 3
2 1
4 7 5
2 4 7
Hard #6
6 9 2 7
9 6 8 4
3 1
3 7 1
9 5
1 7 2 9
8 1 2
6 1
1 3 7 8 9
Hard #7
6 5 3 8
5 8 9 4 6
4 1 3
2 3
7 8 5 9 6
3 2 7 8
4 7
8 7 6 4
Hard #8
8
4 5 1 7 8 2
6 3
4 3 1
1 5
6 5 7 4
2 6 9 1 3
5 7 9 2 4
9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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