Printable Hard Sudoku

Set a7bbop. 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 9 6
1
2 6 5 7 3
8 5 3 2 1
9 1 6 4
4 1 3
5 7
1 6 7 2 5
3
Hard #2
7
6 8 2 3
9 7 5 1
9 7 8 3
8 6
2 1 7
1 9
2 9 1 4
3 4 6 8 2
Hard #3
2 9
8 6 5 9
3 2
1 7 3 8 9
4 5 7
9 1
8 1 2 5 4
1 2 8
3 9 6
Hard #4
1 5 3
5 4 1 6
1 8 2
5 7 2 9
8 4 5
7 3 2 4
8 9 7 5
9 4
6 3
Hard #5
5 2 6
4 1
3 1
6 1 8
2 1 5 6 8 9
8 1
1 5 4
3 7 4 8
2 6 9 1
Hard #6
2 6 7
8 9 5
7 6 5 3
5 8 1 2 9 4
6
1 4 9 6 3
3 4
3 2
5 2 7
Hard #7
7 2 8
4 8 7 1
3 1 6 7
6 1 4 5
8 3 6
9 3
6 2 9
7 4 3 8
5 9
Hard #8
6 1 2 4 9
7 6
4 6 8
2 5 8 7 3
8 6 9 7 2
3 8 5 1
9 4 8
2 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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