Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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