Printable Hard Sudoku

Set 4oud3. 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
3 2 5
5 7 6 3
8 9 7
2 9 1
9 3 4 7
8 4
6 4 9
8 2 5
4 3 1 8
Hard #2
5 8
5 6 7 9 2 4
2
7 3 1 4
2 1 4
6 8 7 3
9 1 5
6 7 9
9 8 1
Hard #3
6 1
1 4 3 2 9
1 7
3 4 8
4 2 3
9 2 5
7 3 2 1 4
7
3 6 2 9 1
Hard #4
2 8 3
4 7 2
6 2 1
1 8
9 4
9 5 6 4
6 1 8
5 9 8 4 2
4 3 2 7
Hard #5
6 5 3
3 7
9 5 7 6 4
4 2 6
9 7 5
5 1 2 8
1 7 6 4
2 3
7 2 1
Hard #6
5 7 8
2 5 9 6
4 6
2 9
8 4 1 5
4 3
6 1 2 9 5
5 3
7 4 1 6 2
Hard #7
2 8 9 3
1 9 2 5
5 4
4 1
9 7 5 1 8
3 6
6 9 7 3 8
3 1
9 7 1
Hard #8
1 9 7
3 5 7 6 4
5 8
6 1
9 7 1 5
2 4 7 9
4 1
9 5 8
5 9 6 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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