Printable Hard Sudoku

Set 1lm4i5j. 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
4 9 7 1
7 2
4 8
3 1 5 9
6 1 9 8
4 6 7
8 1 3
9 6 3
6 1 4 5
Hard #2
1 4
1 8 9 3 5
7 3 4 2
3 2 7
7
3 7 6 1 8
6 5 9 2
2 9
9 8 6
Hard #3
2 8 6 5
6 7 2
8 7 2 4
2 8
1 7 9 5
3 4
5 7 3
4 1 8
9 3 5 8
Hard #4
6 7 1 8 9
4
2 9 3
7 6 2
6 3 8 2 4 1 7
4 1 9
1 6 7
3
5 2 1
Hard #5
3 1 2 5
9 3 1 7
9 5 8
6 1 3
3 8 9
1 3 4
6 8 7
1 9 2
9 5 6
Hard #6
4 1
8 1 4 5
9 5 3
3 8 6 2
9 5 8
4 5 7
1 9 4 5
3
7 5 2 1 3
Hard #7
6 5 7
9 4
5 1 2 3
7 8 6 5
8 9 6 1 3
9 6
6 5 3
3 8 2
5 8 6
Hard #8
1
3 7 2 8
5 8 6 4 1 3
9 8 1 3
7 5
6
6 9 2
7 3 9
3 8 6 9 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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