Printable Hard Sudoku

Set 1xuz79. 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 3 7 1
1 2 4 7
5
3 7 2 1 5
7 3 2
5 3
1 8 4 9
1 6
8 3 7
Hard #2
5 6 2 4 9 3
2 8 9 5
7 1
8 9 3 2 7
2 4 1 9
6
7 5 6 2
8
1 4
Hard #3
8 7
3 7
3 4
4 1 5 8 3
3 7 1 9 5
2 8 6 4
9 6 5
4 3
8 4 1 9
Hard #4
1
4 2 3 1 8
3 2 9 6
2
4 7
3 1 8 5
4 1 9 5
5 8 7
1 6 5 9 2
Hard #5
2 7 5 8 9
5
4 6 8
8 1 9
4 5
9 1 5 6 3
8 2 6
5 9 3 1 2 8
8
Hard #6
1 5 6
9 1 2 6 5
4 8
7 4 2
1 7 3
5 7 9 4
6 3 8 4
4 8 9
1 4
Hard #7
2 6
9 5 8
4 7
9 2 7
8 4 5 1
1 6 7 8
3 4 9 2
5
5 2 9 8 3 7
Hard #8
8 7 2
5 6 4
7 6
9 3 2 6
5 7 3 2
1
3 4 1 8 7
2 3 8 1
8 7 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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