Printable Hard Sudoku

Set b3ee11. 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
4 1 5
2 1 9 6 5
7 6
4 5 2
9 5 7 6 2
9 3
3 9
8 6 7
3 2 6 8
Hard #2
9 3
5 8 7 9
7 2 1 8
9 5 6 1 7 2 8
1 3 4
8 7 3
7 5
8
4 5 2
Hard #3
1 8 9 7
3 7 5 1
2
9 1
5 4 8 9
2 5
8 3 4
5 6 3 4 2
3 4 9 6
Hard #4
9 8 5 3
3 2 4
6 8
5 8 2
9 8 4 1 7
2 7 6 3
5 7 4
8 2 9
6 4
Hard #5
5 2 9
9 4 6
9 4 6 2 3 5
7 9 1 2
8 6 9
4 1
1 8 9 4
2 8
7 1
Hard #6
2 7 6
7 3 2
1 5 4 3
5 2 1
1 5 6
7 1 9
6 9 2
1 5 4 3 7
8 3
Hard #7
1 2
8 1 3
5 6 8
4 8 9 5 6
1 9
3 2 7 4 5
9 3 5 6
4 7
7 6 1
Hard #8
7 4 1
8 2 9 6 5
3 5 1
2 6
6 5 1 3 4
8 3 2
7 9 8
1 7 4
2 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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