Printable Hard Sudoku

Set u5ondz. 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 8 1 9
9 1 5 6
5
9 2 8
2 9 3 7 1
3 7 5
1 2
7 1 3 6
9 2 3
Hard #2
4 2 5 8
6 8 2
2 4 6 3
6 1 7 5
5 8 9
5 1 7
8 1 9 5
2 3
6 8
Hard #3
9 4 6 1
6 2 8
8 2 7 6 9
6 4 9
2 5 4 7 3 8
8
9 3 8 5
3 5
6
Hard #4
2 1 6
7 5
6 9 8 7
2 9 3
5 9 3 4 1 2
5
4 7 3 8
3 8
9 7 6 5
Hard #5
3 9 1 6
9 5 1 3 2
1 8 7 5
4 7
6 5 8
1 9 6 7
6 2 1
8 7 4
1
Hard #6
3 7 1 9
9 5 4
2 5 1 4 3 6
2
9 6 4
1 8 9 3
6 4 5 9 8
4 5
2
Hard #7
1
4 2 6 8
3 4
2 8 1 5
5
8 1 6 5 7 9
2 6 8
6 4
7 8 9 5 6 2
Hard #8
4
1 6 5
2 6 9 5 3
3 5 2
6 2 3 4 7
1 7 3
2 9
5 4 9
3 6 5 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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