Printable Hard Sudoku

Set 1v34uwb. 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
8 7 3 2
5 1 3
6 2
2 1
8 5 4
1 5 9 7 6
3 2 8
2 4 9 5 8
5 9
Hard #2
9 4 1 8
5 7 8 4 3
4 5 1 6 9
5 7
2 3 6
1 9
8 5
7 4 2
7 6 9
Hard #3
9 4 1 6
6 8 2 3
7 8 9
3 2 4 1 6
8 1 3
5 1 9 6
3 4
9 6 2 5
Hard #4
2 6 7 9
7 9 3 2
3 5 1
3 8 2
6 1 4 8 9
9 5 1 3
2
6 1
6 4 7
Hard #5
7 3
3 9 4 5
1 5
5 2 9 1
9 7 8
2 7 1 8
2 8 9 1
6 9 1 3
3 4
Hard #6
1 8 7 5 2
4 9 8 6
6 9 1
4 3
2
7 5 2 1 8
4 7
3 5 1
7 6 2 3
Hard #7
1 7 6 4 2
3 2 8 7
5
8 7 9 4
1 8
5 2 3
2 8 6 3
6 7 4
3 4 8
Hard #8
6 5 9
9 4
7 3 1
5 1 6 2
1 6 7 5
2 5 1 7
6 2 1 3
3 2 9
8 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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