Printable Hard Sudoku

Set 1w3do2i. 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
9 8 2
7 4 1 6 3
2 3 1
6 3 2 1 9
1 8 5 2
2 7
3 9 5
5 6
4 7
Hard #2
6 9 5
7 4 6
1 6
8 2 5 7 1
3 7
9 6 1
9 6 2
5 3 8 7 4
2 4 3
Hard #3
8
9 8 4 2
8 1 4 7 9
7 4 9 1
6 2 9
2 8 6 4
9 7 8 5
1 6 9
2
Hard #4
6 2 7
3 2 8 9
5 8 4
9 1 4 5
2 9 6
6 5
9 7
8 5 7 4
8 7 5 1
Hard #5
8 3
7 2 1
9 8 5
6 2
3 4 5 9
6 3 1
2 8 5 4 6 7
1 8
5 7 4 9
Hard #6
6 1 9 7 5
5 8 4
4 6 3 1
7 9
2 3 7 5
9 1
2 4 7
5 7 3 6
2 9
Hard #7
6 4 3
9
3 2 6
7 1
2 8 6 7 5
4 5 9 1
5 8 3 9
4 2 8
6 4 1 5
Hard #8
5 4
4 1
7 6 1
3
5 3 1 2
4 1 7 6 5
3 4 2 8 6 7 9
6 9
1 8 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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