Printable Hard Sudoku

Set 1vst27k. 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
4
3 9 8
7 9 8 4 5
1 4 2 8
8 5 6
3 8 1 6
6 5 2 9
8
7 6 5 2
Hard #2
7 6 2 9 5
2 1
7 4 1 3
5 1 4
5
3 2 1 7
8 4 3
3 1 8
4 3 2 1
Hard #3
8 5 1 6 4
6 9 7
2 9
7 8 3 6
7 6 4 3
5 3
7 1 2
8 3 9
3 4 8
Hard #4
4 5 2
1 5 4 3
2 8 1 5
6 8 5
4
2 8
6 8 9 4
6 7 3
2 3 5 4 9
Hard #5
5 1 8
9 2 8 3
8 9 4
5 8 9 6
1 3 5 4
9 5 2 7
4
8 3
7 2 3 6
Hard #6
7 3 1 9
6 4 9 5
2 1
3 8 6 4 9
9 2
9
6 7 1 3
1 2 3 6 8
3 5
Hard #7
6 3 4 5 2
7 5 3 9 4
4 2 3
2 4
1 9 8
4 7
3 5
8 6
1 4 5 8 3
Hard #8
9 6 1
7 5 1 4
7 2 8
3 2 8 6
5 4 3
7 5 9 8
2 7
6 9
1 9 6 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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