Printable Hard Sudoku

Set 63843k. 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
9 1
1 2 4
2 6 7
2 5 7 1
1 9 6
6 2 5
2 7
5 7 9 3 2
3 7 8 5
Hard #2
8 1 4 7
6 5 2 7
9 2 6 5 8
6 5
2 6 1 3 9
5 9
3 8 4
8 3
9 6
Hard #3
4 1 8
2 8 9 7
1
2 7 9 4
4 5
6 3 5 1
5 3 4 7
6 7 8 2
7 1 4
Hard #4
2 3 4 8 1
2 7
9 3
4 8 6
1 6
6 9 1 4
9 5 7 3
6 9 1 7
3 2 8
Hard #5
1 4 2 7 5
1 6 2
7 4
5 9 7
3 2 8 1
4 1 3
9 4 6 5
7 5
6 7 8
Hard #6
2 4
4 6 3 2
4 6 9
8
6 7 2 5
2 7 8 1 6
3 1 9
4 5 9 8
9 2 1
Hard #7
5
6 5 9 4 7
8 2 6
4 3 9 8 5
8 7 3 4
3 7
1 3
5 4 3 1
2 8 6
Hard #8
3 6 4
2 9 4
6 7
1 9 2 5
7 9 1 5
4 9
4 1 9 3
8 7
7 1 5 6 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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