Printable Hard Sudoku

Set gigq18. 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
4 7 2
6 9 8
6
4 8 6 9 7
9 2 1 5
5 2 4
3 1 6 2
8 3 6 5
9 4
Hard #2
5 3
1 8 2
9 8
7 6 9 5
9 2 4 7
7 2 1 8 3
8 6 5
1 9 2 4
4 9
Hard #3
1
7 6
1 6 5 8 3
9 8 7
6 7 2 9
2 4 5 8
4 3
9 6 1 7
9 3 6 7
Hard #4
7 9
8 2 9
9 1 4 7 5
7 6 5 1
5 1 2 9 8
4 1 6 2
8 2
6 7
5 2
Hard #5
1 3 5
5 1 6
8 2 7
2 7 5
5 3 9
4 9 6
3 8 9 2
7 8 1 6
9 1 6
Hard #6
5 6 8 9
1 7 3 6
4
3 2 8
6 8 3 7
9 5
9 8
3 6 1 9
7 2 4 5 6
Hard #7
1 2
7 6 9 5
4 3 1 8 2
9 8 5 4 3
4 2
1 8
1 6 4
3 6
7 9 4 2
Hard #8
7
1 6 9 2 4 8
4 8 6
3 5 4 2
9 6 5 2
5 7 8
7 1
4 8 1 6 9
3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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