Printable Hard Sudoku

Set 1fkmj57. 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 7 5
7 2 1 4
6 9
1 2 8
1 2 9 4 7
7 8 5 2
6 3
4 3 8
6 8
Hard #2
5 9
6 3
2 8 4 5 7 1
6 7 8 5
3 7
9 6 8 2
6 4 1 2 9
2 6
1 3
Hard #3
9
3 8 4 5 1
1 4 2
2 4 3
7 8
6 2 7
8 7 6 1
7 5 9 8
3 8 7 4
Hard #4
8
7 2 3 4
6 5 8 9
8 4 9 5 3 1
4 3 5
6 7
7 1 6 8
2
4 5 9 2
Hard #5
9 3 2 1
7 1 2
8 4 3 9
1 4 6
4 2 8 6
8 6 9 3
2 5 7
8 5
7 6
Hard #6
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 #7
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 #8
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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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