Printable Hard Sudoku

Set zoc5g9. 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
7 5 2 3
4 9
2 9 6 3 1
3 2
4 5 7 6
1 8 7 2
9 6 7 8
1
7 6 9
Hard #2
8 7 4 9 1
5 9
2 1 8
1 9 7
6 1 2 4 8
8 2
7 4 2
2 6
5 8 4 7
Hard #3
1 8 5
6 8 2
2 7
4 5 7 1 6
2 9 8 4
9 2 1 4 6
6 4 5 2
1 3 4
Hard #4
6 8 7
2 1 5 6 9
7 9 8 2
3 8 1
7 1
5 6 9
8 2 4
1 5 3
3 5 7
Hard #5
8 7
2 9 6 5 1
7 3 9
5 8 2
5 8 9
3 1
5 9 2 4
4 9 1 7 3
7 1
Hard #6
3 9
6 8 5
5 9 2
2 1 6
7 9 2 6 8
3 1 7 2
1 7 6
3 6 2
4 9 5
Hard #7
1 9 2
8 5
8 3 6 2
5 6 1
2 5 8
1 4 7
9 3 4
6 1 2 9
4 5 6 9
Hard #8
5 3 4 7
7 6 2 4
2 8 3 7
5 3 4
9 6 8 1 3
3 1
4 1 2
1 3 6 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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