Printable Hard Sudoku

Set 1ir6izu. 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
9 4
9 3 2
4 6 1 5
5 6 9 2
2 4 7 8
9 7 1 3
5 7 8
1 3 8 6
7
Hard #2
2 1 7
5 6 8 3 1
7
2 4 5 8
1 4
3 6 4 9
1 8 9 3
7 4 9
9 2 5
Hard #3
5 9 8 1 6
7 9
1 2 3
2 8
3 5 6 4
8 6 7 1 2
3 9
6 4 5
7 8 5
Hard #4
1 9 5
7 2 4
3 6 1
6 3 5
8 7 4 1 6
7 1 3 8 4
5 3
4 1 7
2 6
Hard #5
5 9 1 2
7 6 5 8
4 1 2 5
2 7 3 9
8 1 7
8
4 1 6
6 3 5 2 7
6
Hard #6
3 5
2 9 1 3
7 6 2 8
3 9 7
8 3 4 2
1 7 6 8
4 2 8 7
8 7 1
2
Hard #7
3 7
7 4 9
6 4 3 1 8 2
5 6 4 1 8
4
8 1 3
3 7 9 6 1
9 3
2 4
Hard #8
1 5 6
6 4 1 8
9 4 2 5
2 7 5
4 8 6
6 2 4 9
9 6 7 2
8 4 1
5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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