Printable Hard Sudoku

Set 1xzk9gg. 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
6 1 4
2 7 4 1 3
3 4 6
6 1
1 2
9 4 6 8 5
4 2 3 8
3 5
6 9 8
Hard #2
1 2 6 9
2 7 5 3 8
8 4 3
7 4 6 2
2 9
5 7 2
7 9 4 5
9 2 3 6
Hard #3
4 7 8
3 8 2 7
1 4 8
5 3 1
6 1 2 4
6
7 9 2 8
3 7 8 4
9 5 3
Hard #4
7 6
2 8 7 4
4 8 3
6 1 7 2 8
5 3
1 8 5 2 9
3 2 8
5 1 2
4 7
Hard #5
4 6 7
5 7 6 8
9 6 3 1 5
9 2
3 2 7 8
7 8 9
9 2 3
5 6 7 9
3
Hard #6
6 8 1 4
2 9 4 6
4 2 6 3
4 9 7
5
8 1 7 2
7 2 1 3
4 9
1 3 5
Hard #7
4 3
4 9 7 2
5 2
9 1 3 8
8 5
4 7 1
5 6 9 7
7 6 1 8
7 5 8 4
Hard #8
9 2 3 4
1 5 7
3 5
4 7 2 8 1
9 2 6
9 4
8 9
6 7 8
9 7 4 8 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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