Printable Hard Sudoku

Set 1lx18hc. 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 3 8 7
7 1 5 6
4 9
6 8 4 3
6 1
4 5 2
2 5 9 7 3
5 9 7
5 7
Hard #2
9 3
8 7 6 5
7 5
2 9
2 3 5 7 1 8
8 5 4
7 1 6 2
4 6
4 8 9 3
Hard #3
6 2 5 3
1 3
5 6 2 1
7 3 9 6
5 1 7
9 3 1 8 2
2 9 8 3
9 4
4
Hard #4
9 1
6 4
5 8 2 4
7 8 2 4
7 6
3 9 8
2 4 5 3 7
4 3 2 6
3 1 4
Hard #5
4 6 2 7
2 5 1 6
3 5 4
9 1 3 8
8 3
7 9
8 6 9 4 7 1
9
2 6 7
Hard #6
1 9 4
8 4 3 9
2 1 7
8 9 1
1 9 6 5 4
2 1 9
5
6 9 3 4
4 8 5
Hard #7
7 6
8 7
7 9 3 6 8 1
1 2 9 6
5 2 1
9 6 4 5
9 2 3
1 8
4 8 1
Hard #8
4 2 8
2 8 5 4
7 4 6
1 9 2 5
8 9 1
3 8
9 1 7 3
8 4
6 3 2 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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