Printable Hard Sudoku

Set 1f131ba. 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
8 2
5 3
7 2 5 8
7 3 9 1 8
3 1 4 7
6 4 1 3
4 1 6 9
8
8 7 1
Hard #2
6 9 5 8
4 2 3
6 5 1
5 3 1 7
3 9 1
8
9 7
4 2 3 5 8
8 5 9 6
Hard #3
4 7 8 6
6 3
1 4
7 8 9 2
1 9 5 8 7
2 1 9
5 9 3 8
7 5 2
6 8
Hard #4
4 7 6
6 8 3
3 5 2 8
1 8 2
9 3 4 5
7 2 9
2 9 3 7
4 2 3
5 1
Hard #5
1 4 9
6 5 2 7
3 9 4 6
1 6
9 2 3
7 1
2 1 9 6
4 3 6 5
6 4 8
Hard #6
5 8 6
6 4 3
9 8 3 2
9 1 8
7 9 5
1 4 3
1 3 9 4
7 2 1
6 8 7
Hard #7
2 7 1
4 5 6 1 9
1 8 7
2 1 8 6
6 7 3 4
2 4 7
7
3 7 2 9
1 4
Hard #8
9 8 7 3
1 3 5 8
5 2 1 6
5 1 4 2 6
1 9 5
9 6 4
9 1
3 7
2 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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