Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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