Printable Hard Sudoku

Set 178bb0y. 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
7 3 1 4
8
7 6
4 2 6 8 1
3 1
6 2 1 9 5
2 5 4 3
4 8 2 6 5
7
Hard #2
1 3 5 4 7
2 4 1
5 3
6 9 7
5 7 2
9 8 4 5
9 1 2 4
7 5 2
4 8
Hard #3
9 3 4 2 1
2 7 9
5 9 6 2
7 6 4 8
8 6 9
3 6 5 2
7 1
2 5 7 4
Hard #4
7 9 2 5 3 4
4 9
8 6 7
3 5 1
7 8
2 9
1 7 4 2
6 2 5
5 7 4 8
Hard #5
8 4
3 7 8
9 3 6
1 9 5
7 4 8
5 8 7 1
2 3
8 2 4 9
5 9 1 6 7
Hard #6
8
6 7 8 9 2
1 6 5 8
8 4 3 2
6 5 1
4 8 6 7 3
3 9 7 4
7 3
4
Hard #7
7 2
1 6 2
5 3
1 7
8 1 2 6 7
3 6 9 1 5
8 4 3
4 7 2
5 9 4 1
Hard #8
3 8 1
6 2 7
7 1
3 5 7 8 9
1 3 6
9 5 6 4 1 2
2 9 5
6 7
8 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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