Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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