Printable Hard Sudoku

Set gwbwo3. 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
8
3 5 1 6
2 8 6 7
8 5 4
9 7 8 2
4 9
9 7 2
2 4 3
3 1 8 4 6
Hard #2
2
5 2 6
8 4
7 9
3 2 5
9 4 6 1
3 7 9 6 1 5 2
1 6 4 2 9
8 3
Hard #3
1
8 3 7
6 3 2 4
9 6 2 3
4 9
1 5 9
7 2 1 3 6 5
9 2 4
8 7 3
Hard #4
4 6 2 3
8 4
7 3 6 4 2
1 4 9 5
9 1 6
4 7
1 3 2
6 4
7 9 6 8
Hard #5
3 1
6 5 7
9 8
7 8 3 5 4 2
4 3 7 1
4 5 8 1 7 2
9 6
7 3 9 8
Hard #6
5 6 8 1 7
3 2
1 6
6
7 3 1 2 8 6
2 3
4 7 6 3
6 8 7 9 5 2
4
Hard #7
2 9 8 5 7
6 2 7
8 6 4
3 7 2
4 1 7 8
5
5 2 8
1 3 7 4
5 3 1
Hard #8
2 4 9 6
8
4 8 2 1 7
7 9
4 9 1 8 7
7 6 4 5
7 1 2 6
5
9 4 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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