Printable Hard Sudoku

Set 4o7h2j. 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
6 9
3 9 8
6 7
7 9 5 1
9 4 3
2 1
4 3 6 5
6 3 5 8 7 9 4
8 2
Hard #2
9 1
1 4 7
8 3 2 9 7
2 6 1 3
6 5 1 9
2 4
3 1 6
4 7 5 8
2 3
Hard #3
9 1 6
8 9
2 4 5 7
6 2 8
5
9 3 4 5
7 8 2 1 5
1 6
6 3 1 4 2
Hard #4
4 8 5
9 8 3 2
2 7 1
4 3
3 9 4
6 9 4
3 2
5 8 3 9
6 9 2 1 7
Hard #5
9 4 2
1 3 5 8
5 6
8 1 2
7 4 5 9 8
3 8 5
8 9
6 1
3 1 8 2 4
Hard #6
8 6 3
9 8
6 9 3 4 2
3 7 5
8 5 3 9
7 4 8 2
3 5 7
1 5
7 1 3
Hard #7
1 4 9 2
8 4 3 6
5 4
8 5 9 4
7 1 4 3
6 2
9 6 8
2 1 4
4 8 9
Hard #8
3 4 6
2 5
8 7 6 4 5
3 7 9
1 4 3 7
1 2 8 3
4 9 7
1
1 2 8 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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