Printable Hard Sudoku

Set ixg4zl. 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
6
2 9
4 1 3 8 7
6 8 3
2 4
5 2 9
6 8 3
9 3 7 1 6 4
2 1 4 7
Hard #2
1 7 5 2 8
9 2 5
6 4 7
5 6
2 8 1 5 4 9
5 6
1 7 4 6 3
8
4 1
Hard #3
6 9 8 1
3 9 6 4 5 8
8 1 2
5 4 9
9
6 3 8
4 6 3
5 9
2 8 7 1
Hard #4
7 2
8 3 4 5
2 5 3 8 4
8 9 2
7 9
1 9 3
3 6 2
1 9
6 9 2 3 4
Hard #5
2 4 3 8
5 1 3
8 1
9 2 5
6 3 4 5 9
4 7 2
2 6
7 9 4 5
6 9 7
Hard #6
7 8 9
4 3 1 2
2 7 8 4
7 3 9 5
6 9
4 5
5 6 4 7 8
7
8 9 1 3
Hard #7
1 8
5 2 4
9 8 6 5 7
9 6
1 3 8 7 4 9
4 7
7 1
9 7
6 1 8 5 9
Hard #8
7
8 1 5
2 7 8 6 1
7 9
9 5
8 3
9 4 8 1 6 2
8 5 4
6 9 3 2 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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