Printable Hard Sudoku

Set 1cu9qwj. 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
8 2
3 5 7 1
4
3 2 5 4 9
1 6 4 8
7 5
8 9 6 2 7 5
5 8 4
6 9
Hard #2
8 5
6 3 2 1
4
1 6 8 3 9 7 4 5
9 7 2 1
6 9
8 6 3
3
1 7 3 4
Hard #3
5 1 2 9
5
1 8 3 6
8 5 1
4 8 6
9 7
9 1 3 8 7
3 9 2 4 1
4 5
Hard #4
5 6 3
8 3 1 4
1 3 4 9
9 2 6 1
5 1 9 4
4 2
8 9 4
1 5 2 8
7
Hard #5
4 3 7 1
7 9 2 3
8 7 6
2 5 6
2 7
9 5 4 3
7 3 5 9
3 8
2 6 4
Hard #6
5
2 9
6 4 1 5 7 2
1 8 3 6
5 6 3 1
7
2 1
1 3 4 2
2 7 4 5 1
Hard #7
7 1
1 8 6
6 3 7
8 1
9 7 1 5
7 4 3 6
4 8 9
5 3 4 9 8 7 2
6
Hard #8
7 9 8
5 1 2
8 3 7
6 5
2 4 3
3 4 1
9 7 2
1 5 9 4 2
7 6 8 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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