Printable Hard Sudoku

Set 6f2e4b. 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
6 5
9 6 8 1
4 5 2 9
7 6 8
1 3
8 1 7 4 5
6 2 9 7
7 5 2
4 7
Hard #2
3 2 9 5 8
8 5 3 9
7 1
1 2 6
7 1 4
9 6 2
2 1 7 6 4
4 3 5 7
Hard #3
1 5 6 4
3 2 6
5 9
7 1 8
4 3 2
2 1 7
5 4 9 1 7
2 8 9
6 1 4
Hard #4
9 3 7 6 4
8 2 3
7 3 4 8 5
4 7
2 5 3
8 9
5 6 4 3
2 1 9
9 2
Hard #5
5 3
8 1 9 5
1 2 9 7
3 8 1
2 7 1 9 3
3 6 4
6 8 2 5
4 2 6 8
Hard #6
2 5 8
9 4 2
3 7
9 8 7 4 5
7 9 8
6 3 1 9
2 6 4
7 6
8 4 1 6
Hard #7
3 1 8 4
5 6 1
2 7
2 5 9 7
3 8 1
9 8
8 1 2 6 7
9 3
4 3 5 8
Hard #8
3 2 1 5 9
8 2 7
9 4 5 7 3 8
2 6 7 8 1
4 1
2 4
9 2 7
5 8 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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