Printable Hard Sudoku

Set 1c0ul4k. 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
6 4 2
9 3 2 8
2 5 1 9
3 6 4
2 3 1
8 5
1 8 3 4
8 7 2
2 5 8
Hard #2
9
2 1 6
9 1 3 8 4
7 9 8 5
2 9 8
5
3 5 1
6 9 7 3 8 2
6 5 1
Hard #3
4 7
5 7 3 9
9 2 8 5
1 6
2 3 8 5
5 6 4
9 8 3
6 7 8 5
7 2 9
Hard #4
6 5
3 9 7 4 1
6 1 7
9 2 3
4 6 7
7 9 1
2 3 8 4
9 7 1
4 6 9
Hard #5
2 1
4 9 8 5
4 7 1 8
5 1 3 4 7
7 2 9 1
6
8 3 5
7 1 3
5 3 9
Hard #6
8 9
6 3 5 4
8 6
6 2 4 1
1 6 2
4 5 6
9 8 2
3 6 7 9 5 4
6 9
Hard #7
2 3 1
5 3
4 6 5
3 1 7 6 5
9 8 6 7
2 1 8 9
9 2 7
6 9 4 8 5
Hard #8
3 9 6 8 4
2
6 1 8
8 6 9 5
1 2
3 4
1 2
2 4 8 3
4 3 5 9 6 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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