Printable Hard Sudoku

Set r8kzzz. 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 4 1 8
6 9 3
7 4 2 9
5
7 2
4 2 3 7 1 5
5 3 9 2
2 7
7 1 3
Hard #2
7 3 1
6 7 1
4 9 8
1
5 7 2 1 9
8 4
9 6 7 5
8 1 6 3
7 9 2 8
Hard #3
7 1 9
2 1 7 6 3
5
5 1 3 4
3 9 8
8 5 4 6
7
4 8 2 5
4 2 1 6
Hard #4
6 1 8 2
2
9 7 4 3
8 5
7 5 4
4 8 7 2 3
5 1
1 4 8 9
8 2 1 7
Hard #5
1 7 5 4
4 8 7 6 3 9
6 9
8 7
2
8 2 1 6 5
7 4 3 6
9
7 3 1 4
Hard #6
2 1 6
7 4 5 6
8 6 7 4
4 1
2 5 6 1
1 8
7 4 3 2 5
1 3 5 2
7
Hard #7
3 9 5 6
1 5 3
4 7 2 3
1 9 8 2
6 2 3
3 6 4
9
3 8 7 6
5 8 4
Hard #8
6 7 4 5
7 5 4 2 9
2 5 6
4 7 8 6
9 3 2
3 8 5
5 6 9
6 4 1
1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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