Printable Hard Sudoku

Set othr1i. 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 1 9
7 4 5 6
3 9
2 7 9
6 9 3 8 2
2 8 5
2
2 4 1 7
9 5 1 8
Hard #2
3
1 7 8
1 8 5 6
9 2 3
6 5 2
2 4 8 1 6
5
3 6 9 1
7 1 9 4 6
Hard #3
7 6 5
8 1
3 1 4 6
5 7 9
4 6
6 1 8 4
7 3 6
2 5 1
4 5 8 9 2
Hard #4
1 2
5 9 3
4 6 7 1 5
3 8
1 3 5
4 8 6 7
2 7 1 8
1 4 5
4 6 9
Hard #5
4 5 6 9
6 9 2 7 3
9 1
8 1 2 9 7
6 3
3 8
7 4 9 3 8
2 8 1 5
Hard #6
9 7 5
6 4 8 3 7
1 7 8
9 8
4 9 3 8 5 7
4 5 6
4
7 6 5
3 4 2
Hard #7
2 6 8 7 5
5 2
1 4 9
8 5 1
6 2
4 9
1 2 7 6
9 7 2
5 9 6 8 4
Hard #8
2 4 6 1
4 7 8 9
1
1 6 4
2 6 5 9
9 7
6 2 1 3 7
7 8 9
5 4 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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