Printable Hard Sudoku

Set 179eo5s. 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
2 1 5 3
4 3 5
8 1 6 9
3 2 6 4
1 8
9 4 7 6 5
4 7 3
7 2
7 9
Hard #2
8 1 6 4
3 1 9
6 2
4 1 7
9 2 5
4 7 5
3 2
2 3 7 8 1
6 5 8 9
Hard #3
8 7 3 1
2 1 5
8 6
4 1 9 8
5
8 2 7
9 1 6 3
4 8 6 1 7
5 1 8
Hard #4
2 3
4 1 9 8
9 1 5 7 6 4
2 5 8
4 8 5 6
9 6
8 6
4 8
6 8 5 9
Hard #5
9 5 1 8
1 2 6 3
5 7 1
1 5
2 9 8
8 6 2 3
3 2 8 9
9 6 7
4 3
Hard #6
2 7 1 6
7 3 8
5 9 3
1 3 2 4 8
6 7 4
9 8 2
4 9 1
1 7 5
5 6
Hard #7
3 4 9 1
9 5 6 3 8
2 5
4 2 7 8 6 9
9 5 3 2
9 4
6 4
8 5
9 2
Hard #8
8 6 7 4 3 9
2 7 5
9 8 1
2 6 7
5 1 8 9
7 4 6
3 9 5
6
2 8 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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