Printable Hard Sudoku

Set gu2dtc. 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 2
7 8 3 1 4
2 4 3
2 3
3 7 6 1
8 1 6
9 1
1 2 3 9 5 7
8 5
Hard #2
3 1
6 4 5
9
2 5 8 7 4 9
8 7 6 9 2
9 2 1
9 4 2
9 3 6
8 1 3
Hard #3
3 2 1 4 7
7 1
4 5 2 7 8 6
6 4 2 8
7 8 9
5 2
7 8 3 5
1 5
9
Hard #4
5 2 1 9
9 3 5 8
7 9 4
4 5 6 8
3 9 7
2 1 3
4 5 6
8 3 9 1
6
Hard #5
2
1 4 9 3
4 5 3 1
9 8 6 2 5
5 8 7 3 1
1
6 3 5
8 9
6 9 3 4
Hard #6
1 6 9 2
3 5 8
4 9 1 2 7
1
2 5 6 9
9 3 2
9 3 4
9 7 2 1
6 5
Hard #7
5 4 1
9 6 5 7
3 5 8 4
4 7 3 9
4 9 1
3
3 1 4 2
5 7 4
7 2 6
Hard #8
3 7 1 9
6 8 1
9 3 5 4
2 9 1
8 1 4 7
5 2 3
4 5
2 6
8 6 9 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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