Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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