Printable Hard Sudoku

Set n593ff. 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
6 9 2
5 6
2 9 1
6 4 1
8 1 2 5
4 7 2 8 6
9
7 3 6 1
1 4 9 7
Hard #2
6 1 3 7
2 6 4
5 9 6
4 6 1 2 7 5
9 4 6 7
8 9
9 1
4 3 9
5 2
Hard #3
2 3 7 8
1 4 6 7 9
4 2
3 1 2 9 4
8
6 4 5
1 7 8 4
6 1 2
8 7
Hard #4
7 2 8 9
2 9 6 5 4
6 2
1 6
9 3 1 2 7
4 5
1
3 7 8 1
8 4 6 3
Hard #5
5 1 7 6
2 3
3 2 7 1
6 9
1 4 3 7
3 9 5 4
4
4 8 5
6 5 9 1 3
Hard #6
1 2 8
6 7
3 4 5 2
3 2 1
5 4 6
4 9 5
5 4 8 7
1 3 2 9
6 8 3
Hard #7
2 6 4
1 5 8 9
2 8 7 6
6 4 1 3 2
1 7
3 2
1 6
9 1 4 5
8 7 5
Hard #8
6 9 3
4 9 5 2
8 1 7 4
8 3 9 2 1 5
6 2
9
8 6
2 4 7 6
4 3 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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