Printable Hard Sudoku

Set 1ooqw3j. 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 3 7 2
7 8 2 5 6
5 6 7
2 1 4
4 3 6
5 6 4 8
8
3 2 8 4
4 9
Hard #2
3 2 6 1 9
4 2 6
5 8
5 9
3 1 9 5
9 4 2 6 5
4 1
6 9 3 4
4 3
Hard #3
2 4 3 6
3 5 4 2
1 7
5 9
6 7 3 2
1 7 5 2
5 2 6 7
4 7 1 5
9
Hard #4
1 4 3 6
2 3 9 7
1
8 7 3 5
3 4
1 9 8 6
3 7 6 2 9
2 6 1
7 5
Hard #5
6 9
7 9
5 8 2 9 3 4
6 5 8 2
4 1
2 7 6 9 5
1 4 5
1 6 7
6 8
Hard #6
2 7 5
3 5 4 2
1 7 9 6
7 2
5 1 7 3
4 2 8
8 3
2 4 7 9
9 5 4
Hard #7
6 8 7 4
3
4 9 6
7
1 5 7 8 4
4 3 6 1
5 6
9 7 4
1 2 4 9 3 5
Hard #8
2 4 8
5 3 1
8 1 7 5 6 9
1 8
4 2 6
6 7 3 5
3 7 2
9 6 5
2 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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