Printable Hard Sudoku

Set 1c0ec7a. 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 6 7
6 4
4 1 5 2
3 6
8 3 6 9
7 4 1 6 3
9
4 7 1 8
8 1 4 5
Hard #2
6 5
2 9
5 2 8 1
9 8 3
8 6 9 3 5
5 1 6
8 7
9 5 6 3 1
2 3 7
Hard #3
6 7 4 9 5
9 1 6
4 6 5 2 7
4 1
2 5 7 9
6 8 3
8 4
7 5
1 4 5
Hard #4
7 3 8 1
8 5 6
4 2 7
2 3 4
2 1 6
3 5 1 7
2 1 5 7 3
9
9 6 2
Hard #5
2 8 3
1 3 7
6 4 8 1
9 4
2 6 7
8 3 2
6 2
4 9 3 1 5
8 5 9 4
Hard #6
5 6 3
1 7 5
7 6 8
5 9 7
1 4 5 3
8 4
1 2 6
7 5 9 1
8 6 7 2
Hard #7
3 7 8
2 4 7
9 1 4
2 9 1 7
7 3 6
1 5
4 9 8
5 2 9 6 3
3 7 4
Hard #8
1 7 8 4
2 7 5
2 9 6
2 4 5
7 4 1
9 6 5 1 8
6
7 4 6 5
8 2 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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