Printable Hard Sudoku

Set 1asfst3. 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
2 6 8 5 3
9 2
7 4
6 8 9
7 2
2 9 3 8 4
1 6
7 8 6 9 1
2 4 8
Hard #2
1 7 8 2 3
5 4 9 6
9 5
5 3 1 4
1 4 8
4 2 3
3 4 7 9 1
2 8 6
Hard #3
9 1 6
4 6 7
3 7 4 8 5 1
4
7 2 4 6
3 2 9
8 2 5 4 9
5 3 8
7
Hard #4
6 4 9 3
2 1
5 9 7
1 5 2 9 8 7 6
6 9 8
7 9 3
4 2
2 5
6 5 4
Hard #5
7
8 2 4 5
2 5 1
9 6 2 1
7 8 5
5 3
9 1 6 8
4 9 7 6 2
5 4 9
Hard #6
2 6 5 7
5 3 4 1
3 4
3 8
9 1 6 8 3
2 5 9
5 9 4
4 7 1 5
2 7
Hard #7
2 8
1 7 6 8
3 8 9 2 1
3 5 8 7 2
6 2 8 5 9
6
1 3 9
7 6
6 9
Hard #8
4 8
6 5 2
5 1 9 6
3 5 8
2 3
6 1 7 4
3 5 4
2 7
8 5 2 6 3 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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