Printable Hard Sudoku

Set 149skus. 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 3 7
1 5 4
2 4 3 1 8
9 7 6 2 5
4 6
3
3 2 9
5 2 6 9
3 1
Hard #2
9 2 6
7 8 5 9
5 6 4 8
8 1 2 3
5 3
9 7 5 6
8 1 4 5
6 4
3 2
Hard #3
7 6 2
4 7
6 5 8 4
5 4
2 8 3
4 5 3 1
1 8 4
2 6 9 5 1
4 9 7
Hard #4
8 4
2 8 3
7 3 6
4 6 7 9 2
6 3 1 4
3 6 5
9 6 5
2 1
4 3 8 5
Hard #5
9 2 1 6 5
3 7 5 2
6 7 2 3
3 1 4 8
9 2 6
8 5 2
6 1 5 8
1 8
Hard #6
2 3
1 8 9
6 5 4 7 8
2 5 9 8
1 7 2
2 4
1 5 4 8
2 6 7
1 5 9
Hard #7
9 7 4 8
8 3 7
1 2
8 6 9 4
6 4 7
9 3 7
3 6 4
2 5
9 5 1 3 6
Hard #8
2 3 4
5 1 2 4
8 2 5
6 9 5
1 9 3
4 7
3 4 8 6 2
9 2
6 3 1 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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