Printable Hard Sudoku

Set 1ps1w71. 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 5 1
8 9
3 9 6 8
9 6
3 9
6 5 2 7 8
5 8 6 3 7 2
5
7 8 4 3
Hard #2
4 6 3 8 2
3 1
2 5
5 2 7 9
3 9 5 8 4
3
1 7 9
5 2 7
9 4 5 2
Hard #3
7 8 1 9 6 3
2 1
8 2
9 3 8 5 2
6 7
1 5 4
6 9
3
8 1 3 9 7 5
Hard #4
1 4 7 3
9 8 1
2 6 5
2 1
4 2 9 7
4 9 3 8
8 5 9 3
7 3 6 4
8
Hard #5
7 3
1 9 8
3 5 4
6 5
5 8 1
3 9 6 7 8
3 9 7 5 2
2 4 7 3
6 2
Hard #6
6 7 3 5
4 1 9
3 5 7 6
9 2 4
8 6
2 5 1 3
9 2
3 8 5
6 1 7 8
Hard #7
1 6 3
2 8
8 2 4 3
7 6 1 9 4
1 7 8
9 4
5 8 3 1 4 9
4 5 3 2
Hard #8
3 1 4 5 8
5 6 1 3
8 1 6
8 1 3 5
5 7
7 4
9 4 5 7
6 8 7
8 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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