Printable Hard Sudoku

Set 1a0d67r. 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 5
4 6 3
3
3 8 2 1
6 7 5 3 4
4 9 2
1 8 7 9 6
1 2
9 3 4 5
Hard #2
5 6 1 9
3 2 4
2 8 3
1 9 6 2
2 5
3 4
8 2 7
5 3 9
4 3 5 8 9
Hard #3
7 3 1 9
1 8 3 6
4 7
2 9 3 4 8
5 7 1
2 5
8 7
1 7 5
6 3 5 4
Hard #4
5 6 7 2
9 5 8 6
2 7
3 5 1 8
1 6 2
8 7 9
9 3 4
8 3 9
1 8 7
Hard #5
2 3 1
1 2 4
3
2 9 6 3
8 4 1 5 6
9 5
6 2 8 1
7 4 2 9
7 6 3
Hard #6
4 7 5
6 1 7 3
2 7 5 9
5 4 8
6 4 7
9 6 2 3
1
9 4 3
3 8 7 2
Hard #7
4 3 8 7
3 7 6
2
5 8 6 2
2 9
8 3 4 5
7 3 6 2
1 2 8
6 3 4 1
Hard #8
1 3 7 8
8 5 9 7 3 4
9
6 9 2
4 5
9 4 8 7 3
7 3
4 1 6 9
5 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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