Printable Hard Sudoku

Set 1986427. 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 1 2
7 9
3 5 4
8 2 1
7 1 6 9
3 9 2 8 6
3 2 1
9 4 6
6 9 7
Hard #2
7 8 3
5 1 2 7
3 4
8 1
3 9 8 4 2
1 4 2 9
9 6 4 8
3
9 6 2 5
Hard #3
4 6 9 5
5 4 6
1 2 4 3
7 6 9 3 8
3 8
8 2 7 4
8 4 3 1 9
2 1
Hard #4
4 8 5
8 7 2
6 2 9
1 9 8 6
5 4 1
5 2
5 8 3 1 7
4
3 4 2 9 6
Hard #5
9 6 3 2
2 6 1 7 8 9
3 5
7 8 5 9 4
9 2 1 8
1 5
8 5 4 3 6
9
Hard #6
1 8 2 5
3 5 7 8 9
2 5 3 1
4
2 6 4 7 5
4 3 6
2 7
3 1
1 2 9
Hard #7
1 9
9 8 2 6
1 5 6 2 7
3 4
1 5 3
3 6 7 4 2 9
5 4 3
8
7 3 6
Hard #8
6 1 3 4
5 8 1
1 3
1 8 9
4 5 3
9 1 7 4
7 8 2
9 3
3 5 4 8 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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