Printable Hard Sudoku

Set k5ploh. 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
5 2 6 4 3
9 1 6 7 5
5 8 6
2 6 4
9 3 6
3 1 2 7
4 1
2 8
2 3
Hard #2
8 3 9
4 6 2
6 5
9
5 3 7 4
7 4 9 5 1 2
6 1 5 7
4 6
4 2 1 8
Hard #3
9
1 5 8 3
6 8 7 1
3 7 4
7 9 6 4 1
6 5
2 5 3 9 8
2 5
8 5 7
Hard #4
4 6
8 3 5
8 1
2 3 9
9 8 5 6 4 7
1 3 8
5 6 2
2 6 9 3
5 9 6
Hard #5
3 9
6 8 4
4 3 2 7
8 9 7
5 4 1 9 6
6 3
3 6 7
8 6 4
2 6 7 1
Hard #6
3 7 5
8 3
4 7 3 6
3 7
4 3
9 1 6 2 8
2 8 5 4
1 7 8 4
2 8 9
Hard #7
6 3 4 1 7
6
1 8 7 9
2 7 4
5 9 8
7 1 4 3
6 7 1
2 9 6 1
5 8
Hard #8
5 4
9 2 8 6
1 3
8 6 4
2 9
9 6 7 4 2
7 6 3 2 9
8 5
3 5 9 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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