Printable Hard Sudoku

Set l55p33. 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 8 7
7 6 1
1 2 9
2 4
7 9 1
9 7 3 5 6
4 2 6 8 5
3 1 4
8 7
Hard #2
1 2
4 7 5 3 9
2 9 8
7 3 4 5
2 9 8 7
6 2 8
3 8 2
7 4 6
6 4
Hard #3
3 4 1 9
1 7 9 5
2 5 4
4 9 2
7 8 5 4 6
6 4 7
9 6
7 6 1
1 3
Hard #4
4 6 9 1 2
1 8 6 5
2
5 6
9 8 4
2 7 5
3 7 5 6
2 8 3
9 4 2 1
Hard #5
4 1 8 2 9
2 3
3 4 5
3 8 5 4
5
9 7 8
1 5 4 3 7
6 3
1 9 6 8
Hard #6
9 2 3 7
9 5 8
1 7 5 4
4 6
4 1 3
3 4
6 5 7 2 9
5 8 1
2 1 5
Hard #7
9 4 7
1 2 5 4
6 1 9
3 7 8
8 3 2
6 1
9 8 7 4
6 1 5 7
2 7 5
Hard #8
3 5 6 4 2 8
7 1 2
1 6 5
7 2 9 6 1 4
7 5
9 8 6 7
9 8 3
3 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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