Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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