Printable Hard Sudoku

Set xmmac3. 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 4 3 9 7
8 4 5 1
8 1
4 2 6
7 5
5 9 8
3 6 9 2
1 5 9 4
7 6
Hard #2
6 9 7
3
1 9 3 5 8 7
2 6 7
1 3 6
2 7 3 9
5 1 8
8 2 3 9 1
5
Hard #3
9 3 2 4 6
3 7
7 2 5
2 4
8 1 6
4 6 1 5
2 3
4 8 9
6 9 4 5 3
Hard #4
7 3 6 1
8 7 6
5 4 1 9 2
3 9 8
3 2
2 9
4 1 5 6
6 2 9
5 1 8
Hard #5
6 4 1 8 3
2 9 6 4
1
8 5 9
6 7 8
1 6 7
4 3 5
9 1 8
1 7 5 2
Hard #6
4 2 8 3
4 5 2
8 9
4 2 6 5 3 1
7 9 8 2
3 6 5
5 6
9 5 3 8
9
Hard #7
8 4
3 9 5 7 6 8
2 1
5 8 1
1 6 5 3
8
1 2 9
3 7 5
7 2 4 1 5
Hard #8
1 5 6 8
4 3 5
2 6 8 7
6 7
7 8 6
4 9
9 3
8 6 7 1 2
3 1 4 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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