Printable Hard Sudoku

Set imn369. 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
4 6 9 1 5
6 2
3 5 9
1 9 6 3 4
3 4 5 8 6
2 5
6 2 9
4
9 5 7
Hard #2
4 1 2
3 4
8 3 1
9 7
1 9 5 8 3
2 4 8 9
8 6 3
4 5
3 6 1 2 8
Hard #3
3 8 9 4
9 2
8 7 1
6 5 8
8 4 3 1
7 4 6 1 2
7 3 6 8
9 1
2 6
Hard #4
1 7 2
5 9
3 4 1 5
7 9 5 3
2 4 8
5 4 1
9 3 5 7
7 9
3 9 2 4
Hard #5
6 3 9
3 4 8 7 2 1
7
1 3 6 8 5
8 5 2 9
5 4 7 3 6
3
2 4 5 8
Hard #6
4 6 9
8 4 1
1 5 7 6
9 8 2
5 9 2 4
1 3
6 9 4 8
1 9 5
7 3 9
Hard #7
7 1 9
2 8 9 6
9 6 4
1 5 2
8 9 1 5
3
7 6 4 1 3
3
3 1 5 6 8
Hard #8
9 1 8 7
1 2
4 2 9
5 9 6
5 2 3
7 3 8
7 1 8
5 8 9
3 9 1 4 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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