Printable Hard Sudoku

Set 1tw4182. 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 3 5 6
5 9
7 3
3 8
5 7 1 8
1 5 4
8 6 4
6 8 7 9 1
1 3 4 6
Hard #2
8 9 2 5
5 8 1
7 8
3 5
3 2 6
2 4 6 3 1 5
4 1
3 2 4
6 9 2 4
Hard #3
9
5 6 1 7
9 3 7
6 2 3 1
6 8
7 3 8 1 9 2
8 4
1 7 8 6
5 7 2
Hard #4
8 4 3 2
7 2 9
1 3 9 6 5 8
2 1 5 8
8 3 2
4
6 5 7
1 4
1 9 6
Hard #5
8 7 4 1
5 9 6 8
8 9
6 8 3 2 5
4 2 8 3
1
6 8 3 7 2
2 1 3 9
Hard #6
1 4
1 5 6
8 2 1
3 9
1 4 3 6
9 7 5
8 2 7 9
7 3 4
1 5 4 7 8
Hard #7
3 9 8 2 5 4
9 6
4 5 7 8
2 7 6 3
6 5 8
9 4 7
5 3 9
8 7 9 4
Hard #8
6 9 8 7 1
5 1 6 9
3 8
7 1 5
6 4 3
2 5 6
6 4 5
1 7 3
8 9 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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