Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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