Printable Hard Sudoku

Set 1irr0bm. 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 6 7 3 4
7 1 3 6
5 2 9 3
8 3 4 9
1 9 2
6 3
9 5 8 1 3 7
1
Hard #2
8 2 4
3 7 5 9 6 2
2 9 3
5 8 4 1
3 8
7
6 1 9
7 2 3
7 1 9 5
Hard #3
3
6 9 2 5 4
1 9 5
5 3 8 1 4 9
1 3 6
6 2 1
8 2 5 6
1 9
5 4
Hard #4
4 5 2
9 2 3 4 6 7
8 7 4
2 5 1 9
9 5 1
6 5
7 4
9 5 8 7
6 9
Hard #5
5 9 4 3
3 2 7
6 4
9 5 1
8 4 5
5 7 2
7 9 6 2
4 8 1 5 3
6 9
Hard #6
2 1 3
4 2 1 9
5 6 8 7
5 3 8
4 8 7
7 3 9
2 4
6 4 1
4 7 8 5
Hard #7
2 9 7 8
6
1 8 5 7
8 6 2 1
3 7 1 5
5 7 9
8
2 9
4 5 8 3 7 1
Hard #8
4 2 7 9
8 7 6 3
2 4 8
3 2 7 9 1 4
7 8 5
1 6
5 4 9 1
6 9
6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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