Printable Hard Sudoku

Set 113tsvi. 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 5 3
6 4 1
2 6
4 6 8
5 7 8
7 5 2 9 6
1 2 5 7
8 4 2
5 1 6
Hard #2
7 1 6 3 8
2 6 9
6 1 9
5 8 2
1 9 6
6 8 3 5
7 5 2
7 5 6 9
3
Hard #3
8 1 2 6
2 1
1 9 3 7
6 5 7 1 9
8 4 5
5 9
3 8
7 6 9
9 4 3 2
Hard #4
1 5
5 4 8
8 9 1 2
3 9 7 6
6 1 7
8 9 5 3
7 1 2 3 4
4 6 2
4
Hard #5
1 4 7
8 2 1
9 3
1 8 5 3
9 4 7 8 2
6 8 2
4 1 6
2 7
1 6 9 5
Hard #6
8 3 7
1 7
7 6 8
6 4
4 5 6 9 1 2 3
5 8 1 4
1 2 5
3 5 8
7 3
Hard #7
9 7 3
5 3 7
2 7 1 9
3 6 4
1 5
4 7 9
3 2 9 5 4
4 7 3 2
6 2
Hard #8
5 2 1 7
9 7 3 8
2 8 3
6 9 8
9 8 2
1
9 8 4
3 1 6 5
3 7 8 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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