Printable Hard Sudoku

Set 1wp8fb0. 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
7 3 5 6
1 9 5
9 5 8 2
2 3 4 6 9 8
8 6 7
7 5 9 3
3 7 4
Hard #2
5 2 7 1
4 2 7
3 1 4
7
9 5 2
7 8 9 3 6
2 3 7 8 4
6 5 1
3 8
Hard #3
1 2 4
3 4 8 5
2 9 7
1 6
4 8 5
5 8 4 3 9
9 2 5 7 3
2 6
9 4
Hard #4
1 5 9 4 8
3 4 1
2
6 3 4
8 5
3 5 1 6
3 8 4 1
4 1 2 9
9 6 3
Hard #5
3 8 5
2 6 7 4
9
5 3 1
7 5
4 8 3
5 3
6 5 2 8 1
3 1 9 7 8 6
Hard #6
9 1
8 5 7 4
2 3
1 8
7 6 5 1 4 2
9 7 3
5 2 9 7
3 6
6 9 5 7
Hard #7
4 9 7 5
5 1
6
1 6 3
2 4 7
7 6 9 5 2
8 2 1
1 4 5 2
5 8 4 3
Hard #8
9
3 5 8
2
6 2 1 5
9 3 7 4 1
1 2 9 6 7
9 1 7
1 8 9 6
7 4 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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