Printable Hard Sudoku

Set 1ip485. 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 9 3
2 3 4 7
7 6
4 8
7 6 5 8
8 3 1 9
3 7 8 2 6
1
2 3 9 4
Hard #2
2 9 5
5 7 4 6
3 1 7
7 1 3 8
5 3
2 5 4 6
9 8 7
1 2 8
7 8 5
Hard #3
9 7
9 7 2 6 5
7 4 8 5 6
9
1 5 2
3 9 1 5
5 8 2 1
1 6
9 5 8
Hard #4
1 9 2 6 8
7 6
4 7 1
7 3
9 1
2 4 6 5 7
6 5 3 9
7 1 5
8 9 7
Hard #5
2 4
4 9 6 8 1
4 7 6
5 1 4 7
3 6 9
7 1
4 1 6 3
6 5 1
1 9 5
Hard #6
8 5 4
8 4
6 1 5 2
3 2 7
6 5 7 1 8 2
1 6
7 2 4
6 9
8 3 6 1
Hard #7
7 1 6
7 5
1 3 9 2
3 9 8 1
7 6 9
3
3 1 2 8 9
4 6 3
9 1 3 5
Hard #8
5 3 9
7 5 6 2
2 1 7
1 4 6 2
5 9
2 6 8 1
9 6
1 8 7 3
4 9 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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