Printable Hard Sudoku

Set coq0if. 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 2 7 9
5 4 8 6
1 8 7 2
2 3 6 5 7
6 4
4 3
9 1 8
3 4 9 6
Hard #2
4 1 6 3
3 5 7 1
6 8 9
6 7 2 4
4 9 7 6 5
6
4 1 5 8
5 3 9
2
Hard #3
8 4 9 6 1
4 2 8
1 7 3
1 2 4
6 2
3 9
1 8 3 2
4 6
3 9 1 5 7
Hard #4
2 7
7 3 6 1 2
2 4 3 5
2 1 8 4
6
4 8 5 6
1 5 9
4 1
3 9 6 1
Hard #5
3 5 1
7 8 1 4
8 9 3
5 3 8
6 2 9 7
2 9 7 4
7 1 9 2
9
4 8 1
Hard #6
8 1 3 5
5
7 9 8 6 3
1 3 9 4 2
2 7
5 4 3 7
5
1 2 4 6
6 7 8
Hard #7
9 6
2 3
7 3 2 9 5
7 2 6 4
8 6
5 7 8 3
4 1 9
3 5 2
9 3 8 4
Hard #8
1 6 7 5
7 9 8
2 8 1 3
4 5 8
7 4 1
2 6 1
3 9
4 8 9
7 3 4 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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