Printable Hard Sudoku

Set 5aas8u. 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
3
7 4 3 2
1 9 8 4 5 6
9 2 7 5
2 3 6
4 1 6 2
4
8 2 7 4
6 9
Hard #2
4 9 5
6 3 7
6 2 5 3
1 4 3
9 3 6 7 5 1
7 5 8
3 5
4 6 9
1 4
Hard #3
2 9 8 1 7
1 4 8
1 3
2 7 1 9 6
3 7 5 9
8
9 6 7 4
5 3
6 7 1
Hard #4
6 7 3
3 5 2
2 4 7
6 7
3 5 8 9
7 1 5 8
2 1
9 6 1 8
9 3 7 6
Hard #5
6 2 5 4
8 6
4 9 3 2
2 1 5
6 7
7 5 2 6 1
8 3
3 8 9 4 1
1 6
Hard #6
2 8 3 7
5
6 2 4 1 5
5 1 7
3 4 2 6
8 2
8 5 7 4
3 8 6 9
5 1
Hard #7
1 9 6 5
6 3 7
2
3 5 6 9
2 7 1 3
8
4 9 3 1 7
6 5 8 2
1 2 4
Hard #8
9
2 8 7 1 3
4 6 7
5 9 1
7 6 8 5
8 4 7
3 2 8 1
6 2 4 7
4 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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