Printable Hard Sudoku

Set raxfl8. 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 3 7
1 7 8 4
3 2 5 8
4 5 6
9
2 6 7 9
8 7
3 2 4 7
3 4 6 8
Hard #2
7 4 5
5 2
4 1 9 6
4 7
9 7 6 1
3 6 8 4
2 8 5
2 3 6 4
7 5 1
Hard #3
4 8 6 9
1 7
9 2 7 4
9 3 1
5 8 1
7
6 7 1 5 8
5 2 6 9 4
4 5
Hard #4
4 8 7
5 6 1 9
6 3 2
7 4 6 5 1
9 8
1 4
9 7 6
6 7 2 3
4 3 5
Hard #5
5 1
1 3 5 8
1 2 3
2 6
8 4
1 6 9 3
6 8 7
8 7 2 9
9 1 2 7 6
Hard #6
3 6 8 4
1 5
8 9 1 3 2
8 7 3 5
5 9 1 7
9 2 6 3
4 2 5
7 3
3
Hard #7
2 5
6 4 1
3 8 6
1 4 2 6
9 1
2 7 9 5 6
7 9 2
3 5 9 6
9 3 7
Hard #8
9 8 4 1
3 5 8
3 6 9 2
9 5
3 5
5 3 6 1
2 8 7 3
1 9 4 7
8 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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