Printable Hard Sudoku

Set 1w3u4xy. 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
4 3
7 3 1
4 3 6 2
9 6
1 2 7 3 8
9 6 4 5
1 7
3 9 1 8
8 9 4
Hard #2
3 6
6 1 2
4 2
7 9 1
9
8 9 2 6 3
9 1 6 2 8 3
5 3 1 4
2 3 7
Hard #3
5 7 9 1 8
4 6 9
7
5 6 4 8
8 7
5 9 6
6 4 2 7
1 5 4 3
9 8 6
Hard #4
3
2 5
7 4 1 2 6 5
1 7 3
3 4 7
8 9 4
1 8 5 4 6 9
5 6 7
7 1
Hard #5
1 8 3
7
5 6 7
6 8 4 9 2
9
5 8 6 3 1
3 7 2 4
1 4 3 9
2 4 1
Hard #6
7 9
9 1 4 7
5 3
2 6 5
4 2
3 8 5 2 7 4 6
6
8 6 5 2
7 3 4 1
Hard #7
9 6 7
2 5 3 8 6
6 2 4 3
3 8 9
5 4 1
4 9 3
2 9 1
5 4 8
1 3
Hard #8
8 9 2
3 8 1
6 5 4 7
4 8 7 1 3
5 2
2
1 9 5
2 8 4
6 3 5 8 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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