Printable Hard Sudoku

Set 1dfbd1k. 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
4 3
1 2 4 5
6 1 7
9 1 2 3
3 8 5
8 3 9
6 8
3 2
4 6 2 3 5 9
Hard #2
8 6 5
9 3
9 2 1 4
9 7 2
5 6
1 4 5 6 9
7 4 3 2 9
1 8 5 4
8
Hard #3
5
1 8 4 3
3 2 1 5
8 4
4 1 7
2 3 9 7 1 8
1 7
3 8 7 6
1 5 4
Hard #4
8 4 5 1
7 4
7 6
6 3 9 2
4 7 1 8 6
8 4 5
1 6 5 7
3 8
4 6 5
Hard #5
5 6
5 6 9 7
1 4
7 8 9 5
8 9 7 3
1 2 9 4
5 3
1 5 6
4 2 7 8
Hard #6
6 8
3 5 9
7
9 1 3 8
2 7 6
6 9 1
7 5 1
1 3 4 2 7
3 1 8 4 6
Hard #7
8 1 9 7
6 4 7
5 3 6
6 3 7 2
5 3 6 4
1 9 3
4 5 2
9 1
6 9 3
Hard #8
9 5 2
1 7 9 2
3 1 6
4 1 6 7 5
9 3 1 7 8
2 4 5
3 4 2
9 3 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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