Printable Hard Sudoku

Set 1ahou5d. 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
3 8 9 2
7
5 8 2 4 1
3 5 6
9
1 2 6 8 4
6 5 3
1 8 2
9 3 5 7
Hard #2
2 4 9 6 1
9 7 2 5
5 2 8
4
1 4 7 9
2 6 8
7 9
3 7 6 1 2
2 4
Hard #3
8 9 2 5 1
4 5
6 1 9 7
9 7 8 1
7 5 9
2 5 6 4
1 8
5 8 3
2 4
Hard #4
4 6
3 2 6 7
4 3 1
9 5 1
7 9 2 4
5 7 9 2
3 1 8
2 8 1 9
4 2
Hard #5
3 7 4 9 6
5 3
2 9 4 5
5 8 6 2 9
3 2 7
7 1 4
2 4 1
4 5 7 6
Hard #6
8 5
3 2 1 9
1 3 5 4 8
2 7 5
6 8 3
4 1 6
7 4 9 2
8 9 1
3 7
Hard #7
7 4
8 7 1
9 3
3 9 5 4 1 8
8 7
2 6 5 1
4 1 6
6 2 3
2 1 4 8
Hard #8
4 5 6 7
6 5 8 3
8 6 7 4 5
7 1 8 4
2 3 7
6
5 2
9 3 5 4
8 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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