Printable Hard Sudoku

Set 1kivl16. 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 4
3 5 9
9 6 3 2
3 2 4 6 5
6 4 2
1 5 9
1 8 3 9
8 7 2
6 2
Hard #2
7 1
1 2
6 3 9 7
5 4 1 3
8
4 6 9 3 7 5
7 2
1 9 5 6
9 3 5 4
Hard #3
4 7 8
1 6 9
4 5 1
4 9
3 1 2 7
5 7 6 4
9 1 2
3 5 8 7
7 3 9
Hard #4
9 8 5
2 4 8 9
7 1 5 4
3 2 4 9 1
9 3 2
4 7 3
5 4 8 2 3
1 3
Hard #5
1
1 7 4 8
8 9 3
3 7
6 4 2 5
8 2 6 7
3 8
4 5 6 1 3 2
7 1 4
Hard #6
3 5 7
1 3
4 5 2 1
2 1 7 8
8 6 2
3 1
7 4 3 6 8
5 3 4
2 9 5
Hard #7
4 9 5
3 5
7 4 3 2
6 2 7 5 1
6 4
8 3 7 9
5 1 9 2
9 4 3 7
8
Hard #8
1 6
6 3 7 9 5
1 8 6 4 3
3 1 6 7 4
2 3
9 5 1
2 9 1 7
7 9
8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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