Printable Hard Sudoku

Set 68qzti. 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
4 9 3
6 4 9 5
1 7 8
5
1 5 4 9 2
3 6 7
5 2 3 4 8
3 6
8 7 9
Hard #2
4 7 3
9 7 8 2 5
8 5 4
9 6 3
4 2 9
2 4 6 5
5 4
6 8 4
2 8 1
Hard #3
2
2 1 5 3
7 3
6 8 1
7 2 3
3 2 4 5
9 5 8
1 4 7 2 9
2 4 1 7
Hard #4
5 7
2 6
4 1
8 2 3 4
5 3 1 8
3 4 9 2
3 9 1 7 4
5 9
7 3 4 8
Hard #5
7 1 3
8
5 9 3
4 2 6 8 9
9 4
7 9 6
4 5 2
8 5 9 4
5 2 8 3 1
Hard #6
4 2
3 7 8
8 4 5
4 3 9
9 8 2 5 3 6
6
5 6 3 2 7
3 9
1 7 6 2
Hard #7
6 8 4 9 3
3 9 7
9 1
6 1 3 4
5 6 4 2
2 6
2 5 1 7 4
6
1 2 5
Hard #8
3 9 8
2 5 7
4 1 8 3
3 8 5 1
2 9 8
1 5 2
1 3 7 9
1 9 5 3 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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