Printable Hard Sudoku

Set 18tdimp. 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 9 6 1 8
1 9 2
5 7 2
7 5
8 6 5 4 7
2 4 1
4 6
9 3 7 4
4 6
Hard #2
5 4 7 8
6 2
3 7
8 1 7 2 5 6
5 8 1
9 2
3 1 7 9
7
7 6 8 1 5
Hard #3
1 6 4
2 6 7 1
5 9
2 9 3 1
4
7 9 5 8
2 4 5 6 9 7
3
5 7 1 6
Hard #4
4 2
1 6
6 3 7 4 5
8 2 7 9 6
8 6 9 3
1 4 5
8 3 9 4
3 5 8
2
Hard #5
7 8 9
9 4 1
1 4 5 9 7
4 9 2 3
3 1
6 7 4 5 9
2 4 3 9
8 4
6
Hard #6
8 9
4 3 1
5 3 7 4 8
4 6 5 2
4 1 5 7
6 2
3 6 7 4
3
1 9 8 3
Hard #7
8 4 3
2
2 1 6 9 8
4 3 2
2 9 8
8 2 7 6
1 4 8
7 9 8 2
9 6 1
Hard #8
5 2 9 1 4
4
1 8 3
9 5
1 9 6
7 8 2 4 3 1
8 6 4 5
7 6 5
9 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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