Printable Hard Sudoku

Set 1ulu8a8. 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 5 9 8 1
2
9 1 7 4
5 3 2 4
1 2 8 5
8 7 2
4 6 8
4
9 5 7
Hard #2
1 2 4
6 8
3 7 2 5
9 6 2
7 6 1
9 4 3
8 5 6 4 1
9 8 6
2 5 4
Hard #3
6 5
7 5 9 8 1
2 6 8
2 4 9 5
5 2 7 3 6
8
2 4 1 9
3 9
6 5 2
Hard #4
6 2 1
5 1 9
7 9 5 6
1 6 7 3
7 6 2
4 1
3 7 4
4 7 2
8 5 3 1
Hard #5
6 2 7 5
9 1 7 2
3 9
1 9
2 3
8 3 9 2 6
8 9 2
7 9 3 5
1 9 4
Hard #6
8
6 3 2
7 5 3
2 8 1 9
9 1 3 5 8
5 6 9
1 7 8 2 3
4
1 5 2 8
Hard #7
8 5 7 9 2
5 6
2
7 9 8 3
2 9 4
1 7 5 2
8 2 3 6
5 8 6
4 8 7
Hard #8
8 2 9
3
7 6 4 2 9
1 8 2
2 7 3
5 9 3 6 4
4 9 5 8
3 8 2 7
8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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