Printable Hard Sudoku

Set 166k1wr. 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 2 7 9 6
1 3
5 2 7
6 1 4 7 2
8 5
2 5 3 8
8 4
3 7 8
1 9 6
Hard #2
2 3
1 6
3 6 7 2
6 9 3
8 3 7 1 9
7 9 8 4 6
2 8 4 5 9
7 9 5
Hard #3
3 1 8 7
8 6
7 9
6 3 7 5 9 2
5
1 2 9 7 4
4 2 5
3
8 3 4 2 6
Hard #4
2 9
1 5 2
8 4 5 3 1
4 6 9 2
5 1 7 8
2
7 6 5
5 9 1
3 4 7 2
Hard #5
3 9 4 7 1
7 5 4
8 9 2
6
1 5 8
9 6 4 8
5 8 7 1 2
2 7 3
1 6
Hard #6
1 7 3
8 9
3 4 6
4 7 1
9 4 2 8
1 5 9
4 5 3 7
3 2 1 8 9
2 6
Hard #7
5
5 3 9 2 8
9 7 3 6
6 7 3 5
1 5 9 6
8 6
2 7 1
5 8 3
4 8 9
Hard #8
1 3 6 5
2 9 1 4
8 1
6 5 2 7
9 1 5 7 4 3
8
4 6 2 1
4
6 2 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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