Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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