Printable Hard Sudoku

Set 1puu52c. 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 6 1 8
9 1 8 6
6 7 9
3 1
5 9 1 7
6 3 9 5
4
5 6 2 8
1 8 6
Hard #2
4 3 8 6
1 5 7
4 9 6
6 3 2 5
4 8 2 3
2 3 6 4 9
9 1
6 5 8 3
Hard #3
1 4
8 6 5 2 4 1
9
1 6 3 2
2 5 6
2 4 1
4 9 6 8
3 9 1 8 6 4
Hard #4
9 6 3 8
8 5 9
7 9 1 5
9 5 8 6 3
6 7 8
5
2
1 7 3
2 3 1 6 4
Hard #5
8
1
8 3 6 4 5
7 6 3 5
5 8 2 4 9 6
5 1
1 9 2 7 3
6
7 9 1 5
Hard #6
4 1 5 2
2 7
4 5 7
6 8 1
3 2 4
9 2 5
4 8 6 1
1 5 3 8
8 4 6
Hard #7
3 7 1 6 2 9
9 5 7
8 4
3 8
2 1
6 5 9 7 2
2 9 5
1 2 8
6 7 5
Hard #8
2 1 7
9 6
3 4 2
2 3 6
3 4 7 8
4 8 2 7 1
3 8 5 4
2 8 4
1 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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