Printable Hard Sudoku

Set 1cdxut3. 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 8
6 8 4
4 3 1 9
9 4 2 1
5 7 8
2 7 9 6
5 3 2
2 1
8 5 7 9
Hard #2
9 1 5
8 7
5 2 9
4 5 6 3 8
3 2 8 4
2 7
1 6 8
5 1 3 9
4 9 3
Hard #3
8 3 1
9 7 5 2
2 5 4
4 6 3 9
1 7 5
1 8
2
1 5 4 7 9
2 3 7 1
Hard #4
6 5 8
7 2
6 2 1 9
2 7 9 8
5 1 2 4
8 9 3
7 6
5 3 8
5 9 1 2
Hard #5
4 3 8 2
5 9 4 6 3
7
6
1 2 8
8 1 4 3
6 5 9
2 1 8 4
4 2 9 6
Hard #6
8 5 1 3
3 6 2
2 9 8
4 7 9 2
1 5 9 6 3
3 4 5 7
1 7
9
7 2 1
Hard #7
5 8 2 3
9 4 7
5 4
8 1 3 5
6 5 9
2 3 7 9
7
2 8 9 7
5 2 8 4
Hard #8
8 3 5
1 8 3 9
9 6 8
2 1 6 8
9 2
2 6
7 1 9 4 3
4 8 1
2 3 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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