Printable Hard Sudoku

Set 1bus1b9. 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
7 4
9 2 6
6 3 8 5 4 1
5 6 8 1
2 1 9
5 7 6 2
4 1 3
1 4 5 7
Hard #2
2 3 1 4
4
9 6 3 7
1 7 4 2 5
4 5 8 2 1 3
3 6 4
2 9 6
7 4
3
Hard #3
6 9
9 4 5
9 4 8 1
8 4 2 7
1 6
7 4 9 5 2
8 6 5 9
2
2 1 7 8
Hard #4
5
8 6
8 9 6 2 7
1 5 4
1 6 3 8
4 6 1
5 4 7 6
1 8 9 2
2 9 8
Hard #5
4 1 2
1 3 7 9
9 2 6 4
9 8 7
7 2 1
2 6
2 1 9 8
6 4 2 5
5 6
Hard #6
1 9 2 8
6 5
3 6
9 8
6 5 4 9
7 4 9 6 8
7 6 9
4 9 5 2
4 8 7
Hard #7
4 1
3 1 8 9 7
2 6 8 5
7 1 5 9 4
2 1
9 5
5 6
5 6 7 2 4
5 3
Hard #8
3 4 9 8
4 3 5
4 3 1
8 4 2
9 8 4
8 2 3 7 6
5 6
1 9 5 3
7 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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