Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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