Printable Hard Sudoku

Set eyxau3. 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 6 5 9
4 5
8 6
7 3 6 5
5 8 1 7 9
1 3 2
4 7 2
3 9
2 1 4 7
Hard #2
5 8 3
2 6
4 7 6 2 8
9 1 4
8 7 2
4 3 1
2 9 3 7 4
7
7 5 8 3
Hard #3
9 7 5
8 5 6 9
6 3 8
1 4 9
6 3 1
7 8
4 3 7 1
8 6 9 4
4 3 5
Hard #4
6
3 7 9
9 2 8 3 1
1 6 9
2 5 1 7
6 4
8 1 3
7 1 4 8
6 9 3 7
Hard #5
1 6 3
7 4
9 5
6 1 9 8 2
9 4 6 5
3 7 2
3 5 1
6 2
1 2 4 3 9
Hard #6
4 7 8 9
9 8 1 3
5 6 3
9 4
1 9 8 2
6 1 9
3 5
7 2 1 9 5
4 6
Hard #7
4 3 1
7 1 9 5
3 6 8
3 7 6 9
5 9 8 7 2
4 2 5
3 7
2 7 8
8 6
Hard #8
2 4 5
9 6 3 1 2
5 3 1 6
2 3 8 7
1 3 4
9
8 2 3
4 6 7 5
6 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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