Printable Hard Sudoku

Set 23wnpg. 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
5 3 7
9 6 4 1 5
7 5 3
3 5 9
1 4 5 8
8 1 7
2 8
4 3
8 9 4 2
Hard #2
5
2 4 9
4 1 7
3 6 8 4 5 9
5 9
9 7 5 8
4
1 3 6 4
6 9 5 1 2
Hard #3
7 3 6 2 8 9
2
8 7
2 9 5 3
4 7 6
1 9 8
1 6 3
8 1 2
9 6 5 1
Hard #4
1 3 5 4
6 2
9 3 2
7 8
9 6
6 5 1 9
1 5 8 6
7 6 4 1 5
4 3 2
Hard #5
5 8 2 7
3 1 6 8
4 5
4 7
6 2 5 1 3 4
8 6 5 7
3 2 6 4
5 3 6
Hard #6
3 9 7 5
2 1 8 6
5 1 4
1 8
4 6 2 5
2 8 5 9
3
8 2 3 4
9 6 2
Hard #7
3 8 4
4 7 9 8
7 6 5
5 2
2 5 4 6
8 7
9 6 3
4 5 6 9
2 4 8 5
Hard #8
3 5 8 6
9 7
5 3
8 9
3 9 6 4
4 3 9 2
7 4 6
9 6 8
4 1 8 9 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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