Printable Hard Sudoku

Set 14xxai8. 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 1
3 5 2
7 5 8 3 9
1 7 3
6 4 1 9 7 8
5 3
6 8
7 1 3
9 8 2
Hard #2
1 3 9 7
7 4 6 8
9 8 1
9 8
4 5 1 3
6 7 4
6 7
1 8 4 5
8 3 4
Hard #3
5 6 9 8 2
1 4 9
3 7 6 5
6 1
2 8
7 4 3
7
3 6 9 2 4
7 4 2 8
Hard #4
9 4 3 7
2 7 8 1
5 3 8 2
8 4
6 2 3 5
1 7 6
7 9 5 6
9 5
4 8
Hard #5
2 9 8 3 4
5 2 3 6
6 7 8
8 6 2 7
5 8
1 4 9 5
7 5
9 1 8
8 9
Hard #6
5 7 9
8 5 2 3
7 4 2
6 8 9
3 1 6 4 5 7
5 3 8
3 6 7 4 5
2
1
Hard #7
5
9 8 5 4 3 2
2 3 4
4 5 1
9 5 2
6 8
2 7 3 1 9
9 5 8 7
7 5
Hard #8
9 2 6 1
8 6 4
4 7 8
3 9
7 3 9 4 6
4 9 8
2 3 7
6 2 1
5 8 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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