Printable Hard Sudoku

Set 1twv3lu. 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 2 7 8
2
9 6 3 2 7
4
6 4 7 9 3
7 2 8 5 6
3
1 9 3 5 4
5 7
Hard #2
3 9
2 3 8
9 8 4 1
8 6 5
2 4 5 9
1 7 6
3 1 7 8 6 4 9
1 8
3
Hard #3
7 9
7 8 3
6 4 5 7
9
3 7 4 1 5
2 6 7
3 5 9
5 9 2 1 4
1 7 2
Hard #4
3 5
1 4 3 9 8
9 3 7
1 7 4 9
8 5
3 6
4 7 6
3 8 1 4
6 8 2 1
Hard #5
3 9 5 6 7 2
8 9 4
2 1 3 9
8 6
1 5 2 8
1 9
9 8 5
1 7
2 1 3
Hard #6
8 5 4 9
1 5 6 7
4 9
1 4
5 2
2 8 6 7 5
1 5 7 6 2
3
6 8 9 5
Hard #7
6 5 8
4 7 1
3
2 1 6
5 9 4 8 1 2 7
9 8
7 1 3
3 6 4 9
2 9 5
Hard #8
1 3 8 5
4 9 1
7 4 6
9 8 7
5 2 1 4
7 2 4
3 5 4
9 2
2 4 6 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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