Printable Hard Sudoku

Set 1l4xfw8. 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 9 3
5 7 1 2 4
7 4 2 3
3 4 1 6
7 2
6 7
8 2
9 4 3 1
3 7 5
Hard #2
6 4
1 4 8 5
2 7
2 8 5 1 6
8 7 4
4 6 5 3
9 7
1 6 7 2
7 8 4
Hard #3
1 3 8 4 2
3 4 5 9
8 4 5
1 2 9
3 7
6 3 8
1 4
3 7 8
9 5 6 3
Hard #4
2 9 6 3
7 5
9 2
9 7 4 5
5 4 9 8
3 9 5 7
4 5
1 8 4
5 9 8 7
Hard #5
7 4 8
6 9
5 8 1
5 3 7 6
7 2 5 3
5 8 4 1
3 7 5 2 1 4
2 9 3
Hard #6
7 2 3
3 5 6 7 4 2
8 5
4 2 8 9 6
8
9 3 1
6 5
4 7
2 5 8 9 1
Hard #7
7 4 3 5
4 7
3 2 6 8
2
6 1 4
8 5 2 3
6 1 9 4
3 8 1 9 2
7 5
Hard #8
6 7 1
1 6 3 8
8 9 7 1 5
7 6 9
8
3 9 1
4 2
1 2 5 9
9 3 4 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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