Printable Hard Sudoku

Set 83fp93. 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
7 3 9 8
9 8 5 6
4 9
7 5 4
7 2
6 8 1
6 1 5 8 7
3 9
8 7 4 1
Hard #2
1 6 8 5 4
8 1
2 5 3 8
3 1
6 5 1 3
4 9 7
4 5 7 3
9 5 8 7
2
Hard #3
6 5
6 3 2 7
7 2 4
8
9 1 6
5 6 3 7
4 8 1 7 9
9 5
1 4 9 2 8
Hard #4
9 7 2
6 8 7
5 6 2
4 2 6
3 8 6 1
8 5
4 3 5
2 5 4 9
2 5 9 4
Hard #5
2 3 1
7 6
1 5
8 9 1 4 2
7 2 1
3 4 5 8
5 6 3 2 4 7
3 7 9
8
Hard #6
7 8 2 5
1 9 2 7
3 7
6 7 9
5 6 4 1
8 2 5 4
8 4
3 2 6
1 6 2
Hard #7
5 7
6 8 5 2
2
9 6 1
5 9 8
7 4 2 5
1 8 3 6
3 7 4 9
9 6 5 1
Hard #8
4 5
7 3 4
4 3 6 9
8 3 5
2 7
6 9 1 3
5 4 7 1 6
5 6 9 2
2 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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