Printable Hard Sudoku

Set znl4cu. 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
6 9 2
1 2 7 6
7 1 8 3
4 9 1
6 1 5 9 4
8
9 5 2 1
4 9 6 5
Hard #2
8 4 3 2
4 8
5 9
4 7 9
6 3 8
5 7 4 2 3
5 1 6
4 8 7 3
2 6 4
Hard #3
3 4 6 7
2 1 6 4 8
1 9
6 5
8 5 4 6 1
9 4 2
5 8
5 9
6 7 2 9
Hard #4
6 5
5 1 4 9
3 8 1
3 2 4
5 8 7
4 1 3 8
8 3
7 3 6 9
5 4 1 2
Hard #5
7 8 6 4 9
8 5
2 1 8
9 2 6
6 2 1 3 9
1 2
5 3
8 9 2
4 5 6 8
Hard #6
2 9 3
9 6 4
4 7 5
9 6 3 5 7 4
3 6
5 4 1 3
3 2
4 5 7 8
2 4
Hard #7
2 9 8 3
2
1 4 3 9
4 7 6 3
7 4
5 6 2 7
6 5 4 2
9 5 2
7 8 3
Hard #8
1 9 5
7 8 6
6 3 7
8 1 4 9 6
5 2 8 3
5 8 3
2 1
4 2 6
2 3 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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