Printable Hard Sudoku

Set 15kcgiw. 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
2 5 4
3 6
8 2 5
7 9
5 1 8 3
4 2
4 5 6 3 8
8 2 9 4 5 3
9 6
Hard #2
2 6 7
1 8
9 7 3 4 6
3 4 5
8 9
4 6 5
8 7 6 4 2
7 1 8 9
5 7
Hard #3
9 6 7 1
1 5
8 4 3
4 2 6 7
3 5 9
7 8 3
8 2 4 6
1 7 8
3 7 5
Hard #4
6 8 9 1
5 4 7
1 9 2 7 3
8 5 4 3
9 3 8 4
1 6 9
7
5
3 8 6 9
Hard #5
8 9 7 1 6 3
2 1 6
3 4 8 2
9 3 2
3 4
4 7 8
4 2
8 6
2 6 7 3
Hard #6
3 9 6
9 4 1 8 7
7 4 2
3 7 8 5
9 6 2
4 5
6 9 1
8
4 7 1 9 5
Hard #7
7 5 6
3 1 2 4
7
4 5 1 8
1 7 5 6 3
7 6 9 1
6 1 8 9 3
5 2 4
Hard #8
1 4 5 7 9
6 9 1
7 2 6 5
7
7 1 3
6 5 9 2 7 8
5
3 2 5
8 9 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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