Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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