Printable Hard Sudoku

Set 1k4ga5b. 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
8 3 7 2
3 2 8
7 1
7 5 3 8 2
4
7 3 2 6 8 4
9 8 5
5 6 3
Hard #2
2 3 9
5 7 4
3 6 8 7 5
2 6 5
3 5 7 9 4 6
1 8
9 3 6 7
9
2 4
Hard #3
5 7 2 1
3 9
7 1
4 3 2
2 8 5 1 7
4 5 8
1 6 4
9 2 8
3 1 7 2
Hard #4
6 4 8 1
2 7 9 6
5 9 2
7 9 2 3 1
4 7 6 9
8 3 6
9
5
8 6 7 4
Hard #5
9 6 4
8 5
6 1 8 2
9 2 4 8
8 7 9 1 6
6 7
1 6 3 9
3 8 6
7 1
Hard #6
8 2
4 1 9 7 3
3 8
7 5 6 1
9 8 1 5 4
3 4
5 2 9
5 4 1 7
9 3
Hard #7
5 7 1
7 1 3 4
6 2
6 7
5 6 4
2 4 5
4 8 6 5
5 9 1 2
6 3 9 8
Hard #8
8 5 7 4 2
6 2 1 8
3
9 8 5 1 4
4 9 1 7
6 2 9
8 2
5 9
7 1 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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