Printable Hard Sudoku

Set l0gbny. 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
5 7 3 8
1 8
8 6 3
1 3 5 9 7
8 4 5 6
2 4
5 8 1 4
8 7 6
Hard #2
1 4
3 2
4 7 2 1
5 7 6
6 4 7 1
3 5
2 5 4
7 1 9 8
3 8 7 2 9
Hard #3
8 9 5
9 5 4 8 3 7 2
6 1
3 7
6 1
5 8 4 7
3 6
2 7 4 9
1 5 3
Hard #4
4 6 8 9 7
7 9 5
5 3 1
2 1 7 4 6 9
4 3
6 5 7
8 3
3 9 6
7 4
Hard #5
5 2 1 4
8 2
9 6 8
6
9 5 7 3 2 6
9 7 5 1
3 2 9
6 5 1 4
7 5
Hard #6
9 4
1 2
4 3 5 6 9
3 7 5 4 1 9
1 2
6
7 2 6 8 3
1 6 2
5 4 1
Hard #7
2 7
8 5 7
3 2 4 9
6 3 1 5
3 9 8
9 7 1
4 1 2
9 6 5 8
7 4 6
Hard #8
1 6
5 8
7 5
5 2 8 3 4 7
4 2 9
8 2 9
1 7 6 9 4
1 2 8
4 3 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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