Printable Hard Sudoku

Set f4s8n3. 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 9 4
4 3 5 6 7 2
1 3 7
4 1
1 2 8 3
5
3 5
4 7 3
1 2 7 8 4
Hard #2
3 5 9
8 4 3
2 1
3 6 5 2
4 8 9 1
7 6 8 4 5
6 3 2
9 1 8
2 7
Hard #3
2 1
3
6 7 8 9
1 7
8 3 4 5 1 7 6
2 7 1 9
3 2
4 1 6 8
7 6 4
Hard #4
9 3 8
5 8 9 4 3
1 8 6 9
2 3
7 1 8
9 4 7
3 1 7
7 6 3
6 2 4
Hard #5
7 1
4 8
9 1 7
4 3 8 1
3 4 2 9
7 1 3 4
2 7
8 7 9 2 6
5 9 8
Hard #6
2 8 1 3
7 8 5
1 4 6 9
3 9 6 2
9 3 7 5
7 5 9 3
5 8 9 7
2 1
Hard #7
6 9
9 6 1 2 3
3 7 9
4 1 5
3 8 9
8 2 9
1 8 5
5 7 9 8
6 4 7
Hard #8
4 9 8 5
7 1
8 4 7 9
2 8
7 3 2
5 6 2
3 7 5 1 2
2 3 9
9 4 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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