Printable Hard Sudoku

Set 1avg3jk. 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
2 9
8 7 4
6 8 7 2
2 3
8 6 4
4 7 9
9 4 7 5 3
3 7 6 4
3 8 6
Hard #2
7 4 2 1
9 3 1 6 8 2
5
2 7 9
9 6 3 1
3 6 5
8 5 3 7
6 8 5
2
Hard #3
9
8 1 2 3
2 7 1
3 9 2
6 2 5
7 6
4 8 7
3 1 5 8
8 5 3 6 4 1
Hard #4
5 2 6 8 9
3 8 9 2 7
9 3 6
5
8 6
1 6 3
2 4 9
5 9 6 8
9 1 7
Hard #5
8 9 5 2
6
6 8
4 3 9
5 2 4 8
1 7 8
1 4 7 5
7 5 6 1 2
8 1 6
Hard #6
4 9 5
5 9 4 6 7
2 1 8 4
8 4
7 3 8
7 9 6
2 5 7
8 4 3 2
3 6
Hard #7
9 3 1
7 1 4
1 3 8
5 2
7 9 8 2
4 6 5 9
5 4 8
3 6 4 5 2
2 3
Hard #8
3 4 5 8
9 1 2
3 8 1
8 6 2
7 5 1
9 7
9 8 6
8 6 5 2
6 3 1 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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