Printable Hard Sudoku

Set pur481. 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 4 6 7
8 5 9
4 1 3
8 5 2 9
1 9 2
1 7 5 8
6 9
8 4
1 8 7 6
Hard #2
2 9 8 4
6 5
9 3
8 7 2 1
6 2 3 5
2 4 8 7
1 6 5 7
6 1 5
3 2
Hard #3
3 9 5 2
5 6 4 7 3
2 8
7 4 6 9
2 4
5 7 1
1 3 5
3 4 6
8 1 9
Hard #4
4 2 8 5
8 9
4
2 1 6 8
6 4 2 1 7
7 5
7 6 2 3 8
7 9
9 8 7 6
Hard #5
3 4 5
8 7 6 1
2 6
2 9 4 8 3
8 5
6 7 2
7 2 1 4
8 7
5 6 1 2
Hard #6
1 6 9
3 4 7 2
7 8
3 5
2 9 5 7
2 9 4
4 6 3 8 1
1 2 5 4
3 8
Hard #7
6 5 7 1
1 5 8
6 7 5 8
8 7 4 6
6 7 3 2
1
4 2 5
4 5 9 3 8 1
Hard #8
5 2 7
7 9 1
1 9 7 3 8
1 4 6 2 8
6 7 4
1 8
9
1 8 2 3 7
2 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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