Printable Hard Sudoku

Set c074i6. 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
5 7 2
2 1 3 7 5
4 5 1
6 7 8
8 5 3
7 3 4
9 5 7 2
4 6 9
2 3
Hard #2
7 8 4 1
2 5 8
9 5 3 1 2
4 3 9 6
6 8 3
1 4 5
9 6 7 1
5 3 4
Hard #3
1 9
2 1 3
4 8 2 6 9
2 4 8 6 3
2 1 5
9 4 3 7
9 1 8
7
1 4 3
Hard #4
8 2 9 4
8 5 1
6 3 1 7
2 9 5
7 5
4 9
1 7 8 4 6
6 7 9 1 3
5
Hard #5
7 5 8
6 8 3 1 7
5 9
9 7 2 8 1
5 2 7
1 4 2
1 6
8 9
3 8 4 1
Hard #6
2
4 5 8 6
6 8 9
1 9 4
7 9 5 1
3 4 8 2 5 7
6 7 3
1 9
3 5 7
Hard #7
8 2
4 6 7 1
5 3 6
9 5 6 4 3
6 3 2 5
8 2 6
9 4
7 9
3 4 9 1
Hard #8
4 7 8 2
3
1 6 9 8
1
2 6 4
7 4 3 2
5 3 2 4
1 9 7 8 2 3
8 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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