Printable Hard Sudoku

Set 5mb2gr. 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
1 4 9 2
8 4 3 6
5 4
8 5 9 4
7 1 4 3
6 2
9 6 8
2 1 4
4 8 9
Hard #2
3 4 6
2 5
8 7 6 4 5
3 7 9
1 4 3 7
1 2 8 3
4 9 7
1
1 2 8 6
Hard #3
4 1 9
3 8 1 6
3
4 9 5 6
3 6 7 9
6 4 8 5
7 4 6 9
2 5
9 1 8
Hard #4
1 4 8 7
7 9 4 8
7 2
8 3 7 1
4 9 3
3 5 2
2 9 7
5 2 6
7 6 2
Hard #5
4
9 8 6
1 4 5 3 8
5 1 3
7 6 5 2
8 3 9
6 9 4 7
5 3 8 6
9 2
Hard #6
9
8 1 2 6 9
4 8
8 6 3 2 5
3 2 8 4
7 6 3
1 6
3 8 4
9 5 6 3
Hard #7
5 7 9
2 6 9 1 5 4
8 7 4
3 6 5
8 7
4 2 8
1 3 7
4 2 3 6
6 3
Hard #8
5
6 3 8
1 2 5 6
3 2
8
9 5 4 6 8 2
4 9 5 1
1 8 7 9
6 1 3 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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