Printable Hard Sudoku

Set t01og2. 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
3 2 6 8
4 9 2
2 5 4
7 9 6 3
2 3 8
1 6
1 4
2 8 3 7 4
6 8 1
Hard #2
4 6 5 9
3 5 1 4 9
1 6
7 3 6
9 8 2 7
2
3 2 7
1 8 5 2
2 1 4
Hard #3
7 2 8 5 3
8 1
7 4 8 1 2
3 6
5 4 3 1 7
2 3 5
6 9
8 5 6 9
4
Hard #4
5 8
8 2 6 1
3 6 4 5
9 8 3 1 2
7 3 9 8 4
9 1 3
8 4 7 3
5 2
Hard #5
8 3 2 7 5
7 3
4 9 1 5
5 4 3 1 6 2
1 9
4 3
6 9 3
2 6 5
3 8
Hard #6
8 7 1 3
5 9
6 3 2 5 1
8 9 5 1
5
7 6 1 3
7 8
4 7 9
6 8 4 2
Hard #7
5
3 4 6 7
7 9 8 5
8 4 3 9 6
2 5
9 3 8
7 1 2
2 1 8 6 9
3 5
Hard #8
4 5 2 7
1 9
9 2 8 3
5 6 1
3 4
6 8 5
5 4 6
3 9 4 7
4 9 1 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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