Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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