Printable Hard Sudoku

Set 15c11i6. 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
3 9 4 5
9 5 6
3 7 9
8 9 3
7 1
9 8 2
1 5 4 2 9
5 9 6 4
2 8
Hard #2
5 1 6
1 7 4 3
2 9 3
2
9 1 4 5
9 4 5 1 3
4 6
7
3 7 2 5 1 8
Hard #3
9 6 8 5
1 8 5
5 7 3 8
3 9 4 8 1
6 1 9 3 4
7 1
6 2
4 5 9
3
Hard #4
2 7 4 1
3 5
9 8 5 3
5 3 1 6 7
6 7 2 3
9 4
4 9
1 5 7 4 2
9
Hard #5
1 7 9
3 5 1 4
8 3 2
2 8 3 7
1 9 3 8 6
3 9
7 6 9
8 5 4
5 2
Hard #6
6 7 8 4
7 1
4 2 8
1 2 5
1 2 4 8 6
6 1
8 5 7 1 9
1 8
2 3 4
Hard #7
2 8
1 6
9 7 6 1 8
4 5 1 3 2
1 2 7 8
3 6 4 1
8 9
8 4
7 5 3
Hard #8
9 1 6
7 8 9 1 3
2 9
3 2 5 8 7 1
4 8 5
1 3 2
6 9
1 8
5 1 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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