Printable Hard Sudoku

Set 3uv27y. 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
7 4 6 1
3 4 7 8
2 9
2 8 4 3 9
7
3 5 1
4 1 8 5
2 6 4
3 8 6
Hard #2
9 5 3
2 3
3 4 2 1
9 2 6 7
5 3 8 6
7 4 2 5
3 1 7
7 2 8 4
8
Hard #3
9 5 2 8 7 4
6
4 5 3 2
1 8 7
6
7 8 9 1 4
3 2 8
4 6
6 7 9 3
Hard #4
7 2 5 1
4 9 3
1 5
9 5 7 2 1
6 2 3
8
8 2 4 6 9
5 6 1 3
4 7
Hard #5
8 6 9 3 7
4 5 1
9 3 8
5 3 4 6
7 3
8 1
8 7 3 9
9 2 4
2 6 3
Hard #6
6 7 9
3 6
3 2 7
3 9 5 1 6
6 3 9
5 8
4 1 8 3
1 8 7 4 6 5
2
Hard #7
1 3 8 6 4
5 7
4 6 1 3
3 7
7 4 5 2
5 6 9 1 8
2 6 1
6 7
2 5
Hard #8
2 4
4 3 1 5
8 3 7 6
3 7 5 9 1
1 5 3
8 9
1 4 6 2 5
8 5 6
4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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