Printable Hard Sudoku

Set 1qefa0k. 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 7 3
1 7 3 6 5
6 8 4 2
7 1 2
6 7
3 5
5 9 6 1
8 4 9
3 9 6
Hard #2
2 9 7 6
3 5 6
7 8 3
4 1
9 5 3 1 4
8 3 1 9
2 8 4 6
1 7
9 5
Hard #3
8 9 6
3 6 7
4 6 2 5 1
6 1 2
7 4 9 3
7 1
5 4 6 9
8 6 9 1 5
Hard #4
4 6
5 3 6 4
3 8 4 2
9 2 1 8
4 9 7 2
7 1
9 3 8
9 2
1 3 7 9
Hard #5
2 9 3 5 6 7
6
5 1
3 2
6 7 3 9
7 1 5 6
9 7 5 6 1
1 9 8
2 6
Hard #6
8 9 7 2
1 3 9
4 5 9
5 2 4
8 2 1
5
5 8 9 7
4 2 5 9 3
7 1 4
Hard #7
4 2 7 9
5 4 6 1
9 4 2 1
6 7
8 6 1
7 9 4 6
8 7 9 2
9 3 6 7
Hard #8
9 3
6 2 9
8 5 2 3
2 3 9 8 4
8 6 2 9
2 8 5 1
1 8 2
9 4 5
4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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