Printable Hard Sudoku

Set ptlu52. 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
4 5
7 1
6 3 7
2 1
9 6 4 3
1 5 9 2 6 4 7
9 6 3 8
3 9 5 2
7
Hard #2
5 9
2 5
7 6 1
8 3 4 9 5
2 4
9 5 7 8 1 2
6 5 3 9 1
8 4
2 8
Hard #3
2 5 8 4 7
7 9 4
5 2 9
1 7 3 2
4
5 3 6
3 5
6 2 1 8 4
1 4 2
Hard #4
1 2
7 8 6
7 4
7 5 4 8
3
6 5 8 3 1
2 1 8 3 7
4 9 5 3 6
6 9
Hard #5
8 3
8 6 7
7 2 8 9
6 4 8
4 1 9 2
2 9
3 8 5 1
1 9 5 2
5 4 1
Hard #6
2 3
8 9 1
4 5 7 8
7 4 6 5 8
3 7
9 4
5 4
4 1 9 7
9 4 2 7 6
Hard #7
9 4 3
2 4 7 8 6
6 2 4
1 9 4 8
8 3 7
7 5 2
7 9 1 4
4 1 8 6
Hard #8
9 3
7 8 1
3 4 6 8
4 5 3
8 6 1 7
5 2
8 9 6
6 9 1 2
5 4 8 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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