Printable Hard Sudoku

Set 25xlmv. 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
1 4
7 9 8
9 2 8 5
9 2 4
4 6 1 3
2 5
7 2 9 3
3 6 7 1
6 8 2
Hard #2
5 8
4 6 1 5
8 6
1 3 7 5
8 4 9 3 2
6 1 9
2 8 3
3 6
8 4 5 6
Hard #3
4 7 3
2 5
9 3 1 8 4
9 8 6 3
1 2 9
6 5 9
5 3 7 8
3 4
8 4 9
Hard #4
1 7
6 3
2 4 1 6 3
6 5
8 7 9
5 2 9 3 7 8
2 9 1
4 2
9 7 2 3
Hard #5
7 3
4 9 1 3 5
9 2 6
9 4 1
8 1 5 3 2
6
6 5 8 4 9
2 3
7 6 2
Hard #6
1 9 5 4 8
3 8
6 4 2
3 2
8 5 9
7 1 8 2
2 6 9 1 5
3 8
5 9 2
Hard #7
7 1
1 4 9
5 9 6
2 9 7
4 8 5
8 6 2 3 9
3 4 2 7
6 5
6 7 5 2
Hard #8
2 1 5 3
4 3 5
8 1 6 9
3 2 6 4
1 8
9 4 7 6 5
4 7 3
7 2
7 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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