Printable Hard Sudoku

Set 1c0j7nm. 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
3 5 7 6
7 9 2 4
8 2 5 7
9 1
1 5 7
7 6 9 2
2 3 1 9
9 1
4 8
Hard #2
5 6 9
7 2 3
4 2 3
4 5 8 1 7
9 2 8
1 4
1 3
7 2 1
3 7 6 8 5
Hard #3
9 1 5
7 8 1 2
4
4 7 1 2 3
1 9
5 3 4
2 6 5 3
9 2
4 1 2 9 3
Hard #4
1 3 2
6 1 9 4
4 5
2
4 7 9 5
5 4 8
8 3 4 7
7 3 1 6 8
6 5 3
Hard #5
2 3 9 4
8 3 6
4 8 1 2
2
2 8 6
9 8 6 7
4 1 9
2 6
5 8 4 2 9
Hard #6
3 1 9
1 4 8
7 6 5 2 4 9
4 9 1 7
5 6 8
7
3 9 5
4 7
8 1 4 3
Hard #7
7 9
4 6
3 1 6 9 4
7 1
7 3 5 8 4
7 2 6
7 9 1 6 5 2
8 5 3
1
Hard #8
8
5 3 6 1
9 6 2 7 8 5
2 3
1 6
6 7 4
5 8 6
7 9 3 8
8 5 4 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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