Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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