Printable Hard Sudoku

Set 1w92v8u. 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
3 4 1 9 7 6
2 9
3 5 7 4 6
2 8 9 1
4 9 8
4 3 7 5
6 2
4 8
Hard #2
9 2 6
2 3
4 5 3 9
7 3 1
6 8 5
6 4 1
2 1 7 5 4
7 8 6
1 5 3
Hard #3
1 2 3
9 1 4 2
8 7 6
6 4 2 5 3
5 8 9 2
9 3 8
8
9 7 1 5
5 6
Hard #4
6 4 5
5 4 2 7 8
3 8 2
1 7 2
3 6
9 5 4 1
3 4 6
7 9 1 3
6 7
Hard #5
3 5 4 1
1 5 7
1 8 2
9 7
3 4 5 1
2 9 4
2
8 7 6 1
7 6 3 4 9
Hard #6
8 5
7 4 8 6
8 1
5 2
4 7 9 2 6 1 3
3 4
8 5
6 2 3 8 7 9
7 5
Hard #7
7 6 9
3 2 9
5 9 8 7 6
2 1
2 3 4 1
8 3 9
5 8 4
4 7 1 8
2 7
Hard #8
7 5 4 9
3
8 7 2
3 7 9 2 4
4 1 9 6
2 7 8
1 9 2 8 6
6 9 7
4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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