Printable Hard Sudoku

Set 50nu79. 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 7 4 5 6 2 8
4 2 9 7
2 8 5
3 7
7 8 6
3 6
3 5 9
5 6 7 2 3
Hard #2
1 4 3 2
4 6 8
1 6
7 5 9
4 7
5 3 4
4 6
1 8 9
8 9 2 6 3 1 7
Hard #3
4 2 7
3 6
7 1
8 7 9 2
8 5 9 6 7
5 7 2 4
7 9 1
9 8
6 1 3 8
Hard #4
3 7 8
5
1 3 4
5 7 1 8 3
5 4 2 9 6
6 9 3
3 2 9
2 4 5
4 8 7
Hard #5
2 6 1
6 4 8 7 5
8 7 4
8 2 1 6
4 5 9
2 1
9 8 1
9 3
5 1 8 3
Hard #6
7 8 1 6
5 2 9 7
6
6 9 3
5 3 6 1
3 4 9
1 9 8 4
2
7 6 9 3 5
Hard #7
2 9
4 8 6
2 8 3
8 5
5 3 2
9 7 4
3 5 7 8
1 2 3
8 7 4 2 9 5
Hard #8
3 8 2
1
6 4 9
2 9 7
5 4 8 2
4 2 6
7 2 4
2 4 6 1 9
3 5 7 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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