Printable Hard Sudoku

Set 9dj3g5. 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
2 7 9
7 9 5
3 6 8 5 7
5 7 6 4 8
1
9 6 3
6 9
1 9 8 5
4 5 3
Hard #2
8 4 6 2
9 3 8
9 5 8
9 6 1
4 3
6 3 7 4
2 1 7 8
5 9 6 2 7
6
Hard #3
4 2 9 3
4
2 5 4 7
8 1 3 6 7
5 7 6 1 9
1 8
4 9 7 6
9 8
3 7
Hard #4
1 7 2
8 2 1 4
8 6
4 9
7 9 3 5
6 9 7 4 3
7 1 6 8
4 2
6 2 7
Hard #5
5 6 7
9 4 5 3
2 8 9
3 7 5 4 2
6 4 3
1 9
8 5
1 8 3 6 7
5 1
Hard #6
2 7
8 5
4 2 1
2 5 4 8 6
6 1 3 7
9 2
5 8 1
7 1 9
4 2 8 9 7
Hard #7
3 6 8
4 6 3
2
1 5 7 2
4 9 5
3 9 7 1
8 4 1 9
9 4 2
1 7 3 9
Hard #8
3 4 9 8
5 3 8
8 2 9 6
6 2
1
1 4 7 2
5 8 9
7 9 6 4 1
4 5 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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