Printable Hard Sudoku

Set 127shg3. 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
7 4 9
5
6 9 1 4
9 2 7 6
5 4 3
3 5 8 7
5 7 6
6 4 1
7 6 2 8
Hard #2
1 8 5 6 4
6 9
1 8 5
2 1
1 4 2 6
3 7 8
6 9 4 1 7
4 2 5
1 9
Hard #3
4 3 7 6
2 4 1 5
6 3
1 7 3 8
6 8 7 5 1
9 6 7
7 2
9 3
1 9 5
Hard #4
3 4 2 9 7
1 8 4 5 3
7
5 7 4 9
2 9 8 6
9 8
4 1
2 1 4
6 7 2
Hard #5
2 5 7 9
7 2 8
1 6 8 4 7 2
6 8
8 2
6 4 1
2 9
7 3 6
1 5 7 2
Hard #6
1 9 6 5
3
2 7 4 8
1 2 9 3
4 8 3 1 9 7 6
6
9 2 1
8 3
6 4 3
Hard #7
2 3 5
8 7 3
1 4 8
3 1 4
5 8
6 7 3 1
2 6 9 1 3
6 2 9
7 4 8
Hard #8
9 1 2 7
3 9 7
8 7 3
9 1
5 2 1 8
3 6 2
8 6 2
7 9
5 6 4 8 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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