Printable Hard Sudoku

Set 1ahzt6u. 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
1 6 3 9 4 5
1
8 7
1 8 6
4 7 9 2
6 7 4
4 9 1 2
1 9 3
7 5 1
Hard #2
7 9 3
7 1 2 6 5 4
6 3 2
2
3 1
1 4 6 2
5 3 4 2
4 6 1
7 9 3
Hard #3
2 1 5 3
9 5 8 6
6 3 7
5 7
1 6
3 6 1 7 8
8 2
1 2 8 6 9
7 4
Hard #4
8 3 2 1 7
4 9 3
2 8 5
3
5 8 6
7 1 3 5
1 9 6 4
4 3 2
8 5 9
Hard #5
9 1 8
4 1 9
1 9 8 3
5 4 7 3
8 5
3 7 6
3 1 2
7 8 9
1 3 8 4
Hard #6
1 3 7
1
9 8 2
3 8 2 9 4 5
7 1 6
4 7 2 9
2 9
8 2 4 7
5 8 3
Hard #7
3 9 4
2 4 3
6 8 2
6 7 3
6 7 8
9 4 6 5
9 8
7 5 6
8 1 3 4 7
Hard #8
6 7 1
3 5 7 4 1
2 4
4
8 2 1 6 9
5 7 1 2
5 1 7
1 3
3 9 6 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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