Printable Hard Sudoku

Set qi8r13. 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
5 7 8
8 9 3
1 4 8
9 1 5 8 4
6 1 5
7 8 9
9 1 3
5 2 3 7 9
6
Hard #2
9 5 6 8
5 9 1
8 2 6
8 1 5 9
2 8 5 6
7 1 2
7 4
4 9
6 3 7 5
Hard #3
7 5 9
2 6 8 1
6 1 2
3 5 6 9
2 3 8
7
7 5 3 2
4 3 2 1 6
1 5
Hard #4
3 1 4
6 9 2 1
7 2 9 8
1 9 7 4
8 7
6
9 5 6
8 5 4 9
7 8 2 3
Hard #5
4 1
5 2
2 9
2 8 4 5
4 1 9 2 8
9 5 7 4 3
3 9
9 6 5 3 8
8 2
Hard #6
2 4 1 9
6 9
5 6
6 3 8 5
9 7 4 6
5 3 2 1
4 2 9 1
7
5 6 1 4
Hard #7
5 7 3
4 8 5 9 6
1
1 6 7 2 9
9 4 8 3 6
2 5 4
6
5 7
8 9 7 1
Hard #8
3 5 7 6
5 6 9
1 4 9
8 2 4
7 3
9 4
8 4 2 6
9 6 8 2 3
7 5 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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