Printable Hard Sudoku

Set erw4p0. 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
9 6 5 3
8 9 7
4 3 2 9
8 1 7 2
4 1 7
6 3 4
4 5 1
1 9 2
4 6
Hard #2
5 6 2 9
3 1
5 7
8 9 1
4 2 8 9
2 6 3
9 3 7 4
7 4 2 5
3 4 8
Hard #3
3 1
9 5 3 7
9 3 4
4 1 6 2
2 8 5
5 4 8 7
6 3 5
7 2
4 8 1 5
Hard #4
7 4
2 6 8 1
6 8 9 2
1 9 6 2 3
4 7 5
2 6 1
1 5
6 4 9 3 8
5
Hard #5
1 9 4 2
4 6 8
2 1
9 5 6 4
7 9
6 3 2 7
5 4
7 8 5
4 2 7 6 3
Hard #6
7 6 9 3
8 2 4 7 5
3 1 7
1 2
4 6 2
4 3 1
2 8 9 3 4
8
9 4 2
Hard #7
9
3 7 8
8 6 5 7
6
9 7 4 8
1 5 6 3 9
2 7 1
2 3 6 8
4 3 1 6
Hard #8
8 4 7
2 1 6 5
9 8 1
3 5
4 9
2 9 7 3 8
6 1 4
1 7 5
3 1 6 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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