Printable Hard Sudoku

Set 1nlpfw7. 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 8 5
1 5
5 1 4 9
5 7 3
3 1 6 7
6 5 9 8
7 2 6
5 4 6
1 3 4
Hard #2
2 8 5 7
3 1 2
8 7
9 7 8
7 3 2 4 1
4 7 1 6 9
4 5
6 2
5 7 3
Hard #3
2 1 9
4 2 6 3
5 7
5 8 6
6 2 9 4 5
5 8
3 8 7 6 2
3 5 2 4
7
Hard #4
2
4 3 8
1 7 6 8
3 2 5 4
5 7 6 3
9 6 8 5 3
1 7 9
4 9 6 1 7
Hard #5
8 4 3 7
8
2 1
4 3 6
6 8 2 4 1 9
9 7 3
8 7
5 9 6 3 2
1 7 6
Hard #6
1 2 7 6
5 1 8 4
7 8 5 3 1
2 3 4 6 5
2
4 8 2 7 9
6 8 2
5 9
Hard #7
6 8
8 4 3 9
4 1 8 9 7
6 1 3
7 8 1
1 4 6 8
5 3
3 9
1 8 2 9
Hard #8
3 2 6
7
6 5 8 1
2 8 1
9 1 4
8 7 1 3 5
1 6 5
9 7
9 7 3 2 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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