Printable Hard Sudoku

Set 1d57q91. 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
9 3
1 9
7 2 8 1 3
9 2 8 4 7
5 6 7 4
5 3 8
1 8 2
5 8 2 7 9
Hard #2
1 6 2 3
4 9 8 7 2
3 5
4 8 1 5
5 6
3 4 7
6 7 4 9
5 8
9 3 6
Hard #3
4 2 8 1
4 5 8
6 5 2
8 6
4 3 9
3 4 1 8
4 2 1 3
8 1 3 4 9
9
Hard #4
5 8
2 9 3
1 9 5 2 6
6 3 1
8
5 6 2 9
9 2 8 7
4 5 7 3
8 6 1
Hard #5
2 9 3 1 7
3 8
7 3 2
4 9 6 5
6 9 4
3 2 6
2 4 6 1
1 7 3
1 2
Hard #6
4 9 3
7 8
6 2 7 9
2 6 5 8
6 2 8
8 1 4 2
5 3 1
6 8
5 3 7 6
Hard #7
5 2 3 8 1
1 9 7 5
7 4
2 8
2 7 6
9 5 6 7
7 4 8 9
1 3
3 5 9
Hard #8
9 1 4
3 6 9
8 3 2 1
3 1 5 8
4 5
2 3 1 8
2 8 7
8 5 2 6 9
6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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