Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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