Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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