Printable Hard Sudoku

Set 1n6vg7k. 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
6 1 7 8
5 6 1 9
7 2 3 4
6 3 8 5
1 8
1 8 4
3 4 6 9
9 3 1
Hard #2
3 5 1 2
9 2 5 3 8
6 2 7
8 9
9 3 2 7
5 6 3
6 3
7 4 1
7 4 2
Hard #3
3 8 1
2 5 3 6
9 7 4 5
2 7
3 5
1 4 2 8 3
6 8
3 2 4
5 8 2 7
Hard #4
4 2 1
5 9 4
6 2 7
3 4 5
2 9
4 3 7
9 5 3 1 4
7 1 6 3
8 5 7
Hard #5
2 3
9 8
1 5 9
1 5 7
8 4 3 7
7 9 1
7 9
2 1 3 5 6
9 3 6 4 8
Hard #6
3 6 2
7
1 9 5
4 5 7 8
8 5
2 7 5 6 1 3
1 5 6
9 2 8 7
7 4 9
Hard #7
6 7 2
2 9 3 6 8 7
5 6
2 4 9
1
3 5 4 8
4 2 9 6
6 5 7 1
5 7
Hard #8
7 2 3
2 4 6
5 3 6 1 4
7 5 4 9
6 2
9 4 6
1 4 7 9 2
2 6 1
9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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