Printable Hard Sudoku

Set 18ix7nu. 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 9 1
1 6 2
9 5 7 6 2 3
7 1 8 2
5 3 8
9 2 1 6
7 9 8
8 7
1
Hard #2
3 7 9 5
6 7 9
2 4
8 2 9
5 8 6
2 7 1 5
1 5 9 6
7 2
6 5 4 1
Hard #3
9 1 2 4
4 6 2 8
8 9 2 7
3 7 2
1 3
8 5
9 2 7 6
1 6 7 8
5 4
Hard #4
7 2 1
8 9 5
9 2 7 4 8 5
2 1 3
4 9 6 8
9 5 2 7
3 8 9
7
4 2
Hard #5
1 3 7
7 6 3 1 5 8 4
7 2 6 9
1
1 5 4 8
2 4 3
6 9 2 8
3 5 4
Hard #6
5 3
2 1 4 7
5 8 1 2 4
8 7
7 2 3
7 4 9
8 1 7 5
3 8 4
8 9 1
Hard #7
3 4 9
2 7 5
7 3 8
9 7 6
2 1 3 8
9 6 2
5 8 3
2 8 7 5
4 6 9
Hard #8
9 6 5 8
6 5 3 1
8 2 1
6
1 5 9 2
2 9 1 8
2 9 1 5
4 1
7 2 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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