Printable Hard Sudoku

Set 8la4f6. 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
5 9
3 4 5 1
3 1 8
8 4 5 6
5 3 1
8 4 9
4 1 5 9 2
2 9 7 5
7
Hard #2
8 2 9 3
7 6
8 3 5 4
3 9 8 4
9 8 5
3 7
3 9 1
8 1 5
2 1 3 5
Hard #3
1 7 8
5 3 1
8 1 2
1 2 6 5 3
6 1 2 7
2
2 1 8 6
6 2 9
5 2 1
Hard #4
1 3 6
9 3
1 8
7 9 8 6
6 8 5 4 1
2
2 4 3 5
4 5 1 9 8
8 7 9
Hard #5
1
2 6 3
3 8 9 7 4
2 4 8
3 5 6 4
6 5
2 3 1
5 2 8 4 7
3 7 8
Hard #6
4 7 2 6 3
9 1 3 7 2
2 3 9 6 5
3 1 6 9 8
9 4 1
7 2 9
6 7
8
Hard #7
8 9 2 1 7
2 8
6 1 7 9
9 4 8 5 3
9
6 5
2 3 7 8
6 5 2
5 7 4
Hard #8
6 3 2 5 7
9 7
8 1
6 5 3
8 4
2 8
7 6 5 8 4
4 7 3 2
9 4 7 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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