Printable Hard Sudoku

Set 11w2zdl. 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 8 5 9
8 2 9
5 7 4 3
1 7 2 4
4 7
3 4 6 5
4 8
9 1
2 1
Hard #2
4 2
1 9 2
3 7 5 8
1 8 5
2 1 4 7
6 1
8 7 9 3
1 2 4
5 8 9 4
Hard #3
7 5 1 4
2 4 3 8
3 6 8
3
5 6 4 1
1 8 4 7
7 8 6
8 1
6 2 5 7
Hard #4
6 2 7
9 2
5 6 4 9 8 1
3 9 1 5 7
1 4 3 6
6
3 1 5
7 5 8 9 1
Hard #5
1 4 3
2 7
5 7
4 3 1 2
9 6 8
8 2 9 6
5 6 8 3
1 5 8 9
2 7 1
Hard #6
7 1
5 4 1
9 7 8
2 3 1
8 5 3 4 6
3 1 6 9
7 3 2 5
6 2 9
4 6
Hard #7
1 8 9 2
9 2 4 6
3
3 5 2 8
7 4
8 4 6 2
8 7 6 9
9 3 2 6
6 5
Hard #8
5 8 6 7
4 1 5 3 9 2
8
1 2 7 3
2
5 3 2 6
1 4 5 8
6 2 1
5 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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