Printable Hard Sudoku

Set 9i55d6. 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 7
5 7 4 9 1
3 4 7 1
7 1 9
6 3 2 4
7 6
9 4 8
5 1 8 2 3
Hard #2
1 2
1 4 6 3
3 6
5 4 2
1 5 9 6
7 9 3 8 5
6 5 3 8 7
3 4
8 1
Hard #3
9 8 6
5 3
3 9 4 7
5 4 8
2 7 8 1
6 3 1
2 3 1
3 5 1
7 8 2 5
Hard #4
2 6 3
8 5 1 7
1 3
6 9 3
9 2 5 4
4 2 5 8
9 2
1 4 9
8 9 5 1
Hard #5
3 6 4 7 1
9 1
2 7 6
1 3 2
1
4 8 5 2
8 6 1
5 9 8 4
5 4 2 3
Hard #6
4
9 3 6 7 8
1 4 7 2 6
7 1 5 3 4
2
6 8 4
1 7
8 3 5
8 5 1 9
Hard #7
4 8
3
9 8 7 4 5 1
6 8 2 4
6 7
5 7 1
6 7 1 5
4 6
7 5 8 6 3
Hard #8
2 1 7 4 9
7 1 5
4 9 2 3
7 9
8
6 3 4
9 2 6 8
6 5 1 7 3
1 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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