Printable Hard Sudoku

Set 10l01rf. 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
5 1 9 7
1 5 2 6
6 8 7
5 8 2
2 7
6 4
4 9 1 7 5
4 8 2
3 6 4
Hard #2
6 5 2
8 4 3 7
9 1
2 9 4 1
8
1 4 9 6
9 4 1 3 7
6 1 3 5
7 6
Hard #3
3 4
2 9 8 3
6 5
9 3 2 5
8 4 1 6
7 9 6
4 3 5 9
1 4 2
7 3 6
Hard #4
4 8 3 9 1
1 2
2 3 5
9 3
9 6 8
5 1 4
5 9 3
3 8 1
2 9 4 5 3
Hard #5
8 4 1
9 2 6
1 9 8
2 9 6 1 7 3
8 7 6
3 8 1
2
7 4 9 3
9 5 1
Hard #6
6 8 1
7 9 2 3
7 4 2
8 2 4 3 7
1 2 8
4
1 2
9 4 3 1 2 6
8 9
Hard #7
7 9 1 6
8 7 4
4 2 9 7
9 8
5 6 1 2 7
3 9
2 7 6
6 3 8
3 5 7
Hard #8
7 1 5
5 3 4 8 2
2 1 7
8 7 4
5 2 7 9
6 9 2
1 6
3 5 4 1
8 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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