Printable Hard Sudoku

Set 41wx4f. 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 4 6 1
3 7
5 1 7 3 2
5 3 9
9 2
4 2 8 9
8 5
6 7 4 3
2 9 7
Hard #2
2 8 5 7
3 9
6 4 1 7 2
7 8 1
9
1 5 2 7 3
5 7 4 6
2 3
9 1 6
Hard #3
3 9 7
4 7 1 6
2 1 6 7
7 3 8
6 9 4
7 1 8 4
4
3 4 8
6 8 9 1
Hard #4
8 7 9
6 7 2 8 1
6
5 3 7
9 1 6 4
7 8 9 1
3 7 5 8
9 4 1
2 5
Hard #5
3 1
8 3 9 5
9 2 7
5 7 4 1
9 8 5 2
4
8 1
1 7 9 5 4
6 5 7 8
Hard #6
5 9 4
4 3 1
1 5 2
2 4 5
3 4 1 8
7 3 5
1
5 7 8
7 8 6 3 4 2
Hard #7
1 4
4 9 1 2 5
2 5 3
5 6 1
3 5 7
9 1 5 4
1 7
8 9 6 3
5 3 2
Hard #8
3 1 9
4 2 1
7 6 9 2 5 3
7 8
5 1
1 6 8
1 6 9 3
6 1
7 4 5 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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