Printable Hard Sudoku

Set 1mda37h. 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
6 3 4
7 2 4 6
4 8 1
5 4 7
4 8 7
7 5 3 8 2
7 5 4
1 6
2 7 3
Hard #2
9 6 2 3
1 9
6 3 5 4 7
8 5 1
2
4 7 9 8
7 9 1
2 3 4
5 4 8 6
Hard #3
2
7 8 6 1
3 5 7 9 6
7 1 4
2 5 3
6 1 3
7 3 6 5 2
8 2 9
1 7
Hard #4
8 4 6
1 3 8
5 8 2 1
1 3 8 6
5 3
3 8 7 4
8
4 3 2 9 6 1
7 4
Hard #5
9 3 2 4
8 5
4 2 8 3
4 7 2
9 6 3 4
5 2 9
1 8 5 9
9 4
6 5 1
Hard #6
3 5 1 7 4
4 1 3 6 8 9
9 2
7 4 1
3
3 8 6
3 6 1 5
1 7 4
4 2
Hard #7
9 4 1 3
1 5 7
3 6 2 4
4 2 5 3
5 7 1 4 9
7
9 6
1 9 5
3 1 2
Hard #8
5 6 3
1 3
3 2 1 8
2 4 7 6
7 4
9 5 7 4
9 2 8 6
7 8 3
1 2 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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