Printable Hard Sudoku

Set 6pipl2. 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
3 8 6
7 9 5
5 1 2
4 1 2
3 7 9 2 8
4 9
4 8 3 5
5 6 9 3 1
8
Hard #2
3 5
3 9 1 8 4
7 4 9
6 3 4 8
8 2 7
5 6 4
8 2 9
5 9 1
9 3 4
Hard #3
5 8 1 4 3 6
7 9 2 3
3 8
7
1 6 9 5 4
4 9 2 8
6 7 9 8
7 5
2
Hard #4
5 8 1
1 6 7 4 8
3 4 1
5 4 3 8
8 5
3 6
6 9 7 3
3 5 6
2 5 6
Hard #5
5 6
4 1
9 7 5
3 8 9 7
6 5 4
1 2 7 5 8
1 6 7 5
1 3 4
4 9 3
Hard #6
7 5
1 9 2
8 6
1 9 4 2 6
4 2 8 3
7 2 4
6 3 8 9
5 3
1 5 2 3
Hard #7
4 9
3 2 8
1 5 9
4 8 2 6 3
5 8 7
1 7 3
6 5 7 1 9
2 6
8 4 3
Hard #8
6 9 8 1
2 6
9
7 5 9 1 2
1 2 5
9 3 8 4 6 5
4 1 9
3 8 7
7 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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