Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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