Printable Hard Sudoku

Set 2htg0u. 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
7 6 4
9 5 2 1
1 3
8 5 7 9
4 2 3 6 5
6 7
4 9 3 7
2 1 6
9 4
Hard #2
2 6 9
4
8 4
1 6 3 2
9 5 7
8
7 6 9 5 8 2 1 3
9 5 7
3 4 7 8
Hard #3
4 5 8
9 6 7 2
4 3 7
5 7 4 6
4 2 7 1
3 6
3 4
3 4 6 9
9 8 5
Hard #4
8
3 4 2 1
1 5 3 9 8
8 9 5 2
6 1 9 7
6 9
1 5 3
5 8 2
4 6 1
Hard #5
9
6 8 5
9 2 1 6 3
1 4 9
3 7 5 2
2 1 6 3 4
5 2
4 9 8
1 7 8
Hard #6
8 7
2 1
1 4 3 9
1 8 5
8
4 7 5 6 2
2 1 6 9 8 3
7 9 5 1 6
1
Hard #7
6 9
5 3 4 7
7
4 6 7 1 8
7 8 9 1
8 2 4
7 2 5
2 3 4 8
3 7 5
Hard #8
3 6 5
7 2
4 6 8
5 4 9
8 5 3 4
6 1 9
7 3 4
1 8 6 7 2
2 5 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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