Printable Hard Sudoku

Set 1b8k5k7. 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
3 9 7
6 4 5 9
9 8 5
5 6 7
1 7
7 6 1 8
1 2
2 3 1 8
6 5 9 4
Hard #2
4 7 8 9 2
6 3 9 2
9 4
1 8 7
3 7 5 9 4
6 5
6 1
7 4 2 5 9 6
Hard #3
9 2 1
6 3 9 5
4 1 8 2
7 8 5 1
9 8
8 2 4 9 7
5 4 7
3
8 6 7
Hard #4
9 7 6
2 8 7 1
4 6
9 5
6 8 1 5
3 1 5 2
1 7 4 3
4 9 6 2
6 2
Hard #5
4 8
3 6 9 7 2
2 1 4
9 8 6 3
7 6
8 2 1
2 9 5
1 2 6
5 6 3 7
Hard #6
6 9 2
7 2 8 5
4 3
9 3 6 8
3 6 2 9 5
4 7
5 9 1
3 7 6
8 2 4
Hard #7
7 5 9
3 4
9 8 6
1 3 8 5 6 4
8 5 7 9
1 9 6 8
1 3 2
2
4 1 5
Hard #8
3 8 5 6 4
5 1 2
8 9 6 3
2 7 3 4
1 6
7 9 1
2 4 9
9 6 2
7 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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