Printable Hard Sudoku

Set 18g8kq7. 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
8 7 5
5 4 9 1 7
9 3 4
6 4 7
8 4
4 7 3 5
7 1 3 2
1 2
3 8 5
Hard #2
1 5 2
8 3
3 4 8 6
8 3 1 9
7 1
5 7 2 6
8 2 1 5
3 6 2 4
6 5
Hard #3
2
3 9 6 5 8
4 5 6
1 8 4 9
2 5
7 6 1
8 6 2 4 9
5 3 8 7
4 2
Hard #4
4 1 2
7 6
5 9 2 8 7
5 2 4
9 8 5 1 3
6 9
1 6 5
2 8 7
1 3 4
Hard #5
1 4 8 3
6 7
3 9 5
4 5 8
2 6 9
1 7
5 7 9
6 8 5 2
1 2 9 8 4
Hard #6
9 8 1
5 9
1 8 4 5
7 4
5 6 7 8
9 3 4 6 5
7 8 3
6 5
2 9 3 6
Hard #7
1
9 5 7 4
6 5 9 3 8
3 7 8
6 2 7
9 3
4 7 9 1
5 9 3 4
3 2 5
Hard #8
7 5 6 3 4
1 7 4 5 2
2 5 1
3 8
9 1 4
7 8
4 2 7 8
5 7 9
2 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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