Printable Hard Sudoku

Set 1pplm4c. 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
2
4 6 5 1
7 5 8
2 7 4
1 5 7
9 7 6 3
9
6 3 8 7 2 5
2 5 6 9
Hard #2
2 1 9
9 2
7 1 4 5 3
7 4 5
3 1 5 8
8 9 6
7 6
1 9 4 6
8 3 1
Hard #3
2 6 1 8
8 7 5 3
3 5 6 1
9 6 7
1 9 8
4 6 9
6 2
4 8 5 3 2
7
Hard #4
2 4
4 3 7 5 6
1 8
9 6 4
7 8 9
7 8 6
9 3 2
2 5 9 1
8 5 9 3
Hard #5
6 5 9 1 2
9 6 2 8
4 7 9
9 2 1
8 2 3
1 8 7
4 5 9 6
3 9
2 1
Hard #6
2 5 3 9 4
3 5
7 4
7 2 9
5 8 3 2 4
1 6
5 2 6
3 4 5 1 9
8 2
Hard #7
7 8 3 4 6 2
2 6 8
4 6 5 3
6 1 4
3 5 2 7
7 1 9 8
9 5
2 3 1
Hard #8
2 5 6
6 7 9
9 4 1
9 5 6
2 9 3
7 3 8
9 4 2 8
8 6
9 2 1 6 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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