Printable Hard Sudoku

Set 1pkx7m4. 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
7 3 2 4
4 7 1
5
7 2 8
4 1 9
5 3
7 4 6 1
9 1 7 3
5 1 3 6 4
Hard #2
4 7 8 3
7 8
1 5 9
8 4 3 7 1
3 5
5 4 2
9 7 8
6 2 7 8
3 9 2
Hard #3
7 2 1
1 3 5
4 7 8 6
8 1
6 5 2 1 9 4
4 1 3 5
8 4
2 9 3
4 6
Hard #4
5 2 3 6
4 1 6
3 2 9 7
9 3 1 7 2
5 6
4 3
8 9 6 1
2 1
2 7 4
Hard #5
8 9 6 7
2 1 4
2 3
9 5 1 3
8 7 3 2 6 9
6 4 8
7 2 5 1
1 3 9
Hard #6
8 9 2 3 6 4
4 5
7 4 2 9 3
3 7 2
7 9 8
6
3 8
5 1 3 9 6
9 4
Hard #7
9 5 3
8 2 1 9
1
4 2 6 3
3 5
8 7 5 1
3 5 9 7 4
8 9
1 4 2 6
Hard #8
8 2 1
4 2
5 4 9 7
2 6 4 5
5 4 7 2
3 1 7
1 5 8
9 6 5
3 5 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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