Printable Hard Sudoku

Set u1czrm. 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 8 6
2 1
2 6 5 1 3
4 6 2 8
2 9
9 4 1 3
4 9 8
3 8 2 5
2 4
Hard #2
8 4 5 6
5 4 1
9 2 6
6 9 1
9 3 5
6 2 8
2 6 4 9 5 7
8
5 4 3
Hard #3
5 9 7
9 3 2 1 8
1
6 3 9 8
2 4 7 5
8 1 7
6 3 5 4
9 4
1 9 3
Hard #4
8 3 6 7
9 6 5 8 2
1
4 5
1 2 5
7 9 1 3
2 1
7 1 8
1 6 9 7 8
Hard #5
6 4 9 8
3 9 5
8 7
8 2
7 9 1 5
6 1 3
5 2
4 7 8 1
4 7 5 3 1
Hard #6
9 1 8
5
1 7 9 4 8 2
9 5 6
2 9 4
8 6 7 9
7 4 3
1 7 5
2 1 7
Hard #7
4 7 2 1 9 3
8 4 1
1 6 3
5
5 2
3 2 4 7
7 6 1 4
8 4 6
2 5 8
Hard #8
2 4 5 9
3 8 6
7 8 9 2
9 2
1 8 2 7
6 7 5 3 9
7 9
3 7 4
8 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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