Printable Hard Sudoku

Set zsu5bb. 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 3
4 2 5 9
8 6 5 4
9 5 8
3 9 2 6
8 1
9 7 4
7 4 3 5
8 9 6
Hard #2
9 6 8 5 4
2
1 7 3
9
8 3 5 2 1
5 2 1 3
8 7 9 1 5
6
6 1 7 8
Hard #3
5 4 9
6 3
6 4
1 2 4 7 3
5 1 8 9
4 7 2 5
3 8 5 1 7
9 2
1 8
Hard #4
1 7
7 8
4 9 2 3 5
1 9
6 2 7 8
8 2 6
4 6 8
3 2
9 8 5 2 3 7
Hard #5
6 4 3 9
9
1 9 2 7 4
4 6 2 7
2 1
9 6 5
9 2 7 5 1
3 5 9 4
2
Hard #6
7 9 6
7 3
9 6 8 1 3 4
1 3 4 5 8
5
2 3 7 5
9 4
2 6 9
3 2 5
Hard #7
7 2
5
5 8 1 6 3
2 7 1 9 6
4 1 5 6
6
4 2 1 3
7 6
9 4 8 2 1
Hard #8
2 1
6 8 2 4
8 4 9 7 1 2
1 9 6 8
4
9 5 3
6 9 1 5
3 9 6
8 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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