Printable Hard Sudoku

Set 1873oab. 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
6 4 9 5 7
3 8
8 3 2 1
9 8 3 4
5 6 4
7 2 9
4
1 7 8
4 3 6 2
Hard #2
6 7
5 3
9 8 1 2 7
4 1
5 6 7
4 7 3 5
8 9 7
1 4 8 2
4 2 3 6
Hard #3
1 6 8
7 6
3 9 4
4 3 8 6
1 2 6
8 7 3
7 5 9 2
5 8 4 3
2 9 5
Hard #4
5 8 4 6
9
4 8 6 1 5
6 9 7
4 5 8 3 2
1 2 9
7 2 5 6
6 4 7
2
Hard #5
1 9 7 4 6 5
6
3 5
2 9 5
8 3 9 4 7
7 8 3
8
4 6 1 2
9 8 2 4
Hard #6
6 4 9 1
2 1 3 5
3 9 4
8 9
6 5
7 5 2
7 4 3
2 8 1 6 9
8 3 1
Hard #7
9 3
9 5 6
1 3 7 8
3
2 1 4
4 3 2 7 6
8 7 2 5
1 4
5 6 3 1 7
Hard #8
6 9
1 2
4 5 3 8 1
2 9 6 5
8 9 3 4
3 1 7 2
3 7 8
9 3
8 5 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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