Printable Hard Sudoku

Set 1pqy61d. 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 2
1 3 9
4 5 8 3
3 5
6 4 9
9 5 1 3
1 9 7
2 4 3 1
7 3 8 5
Hard #2
7 9 3
1 6 3 9
7 8 1
5 2 4 9
7 6 5
1
5 4 7 8
6 8 1 2 4
8 3
Hard #3
4 1 5 9
5 2 6
7
9 5 3
9 1 6 5
6 3 9 8
6 9 4 3 5
4 2
8 2 1
Hard #4
1 6
8 1 4
3 4 6 8 2
3 1 7 2
9 3
9 2 3 7
2 7 6 8
9 5
5 7 6
Hard #5
1 6 5 4
2 4 9
3 8 1
9 5 3 7
3 6
6 4 8 7 2
5
1 7 9 8
2 3 5
Hard #6
2 6 7 9
9 4 8 2
6 1 3
1 3
3 4
2 7
4 1
7 3 8 1 6
6 5 4 9 8
Hard #7
7 1 8
3 1 4
2 4 1
8 9 6 5
3 7 9
1 3 2
8 3 5
9 5 4 8
7 8 2
Hard #8
5 3 9 1
8 6 5
9 2 8
2 6
7 3 5
6 5 3
7 3 1 4 9
4 7 1
2 6 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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