Printable Hard Sudoku

Set 6ci1ww. 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 7
9 1 4
4 2 9 3
7 4
1 6 9 5
2 5 7 8
2 3 7 1
6 7 8
4 3 5
Hard #2
6 9 1
2 8 5
7 3 5
9 7 4 3 1
6 2 9
2 8 4
4 8 6 7 3
3 5 4 8
Hard #3
3 1 9
2 9 4 3
4 6
8 3 2 6 1
9 5 8
8 6 4
2 6
8 2 1
6 5 7 1
Hard #4
5 6
8 7 4 3
6 3 2 7
7
7 4 1 5 6 9
3 8 1 7
8 9 3
9 8 5
2 5
Hard #5
4 6 8 5 7 1
1 7 4
9
7 1 3 9 4 8
6 5 9
5 3 7
1 2
9 3 5 8
6
Hard #6
4 7 1
9 5 1 8
7 1 8 4
4 3 1 5
5 7
2 1 7
6 8
5 6 4
9 7 6 2
Hard #7
8 1 3 5
3 7 5 2
3 2 6
1 5 6
9 5 3
4 2 8 6
4 8 5 2 1
3
7 5
Hard #8
2 8 7
9 8
1 8 7 2 9 6
3 5
9 2
7 1 3 9
3 7 6
1 4 9 3
6 3 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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