Printable Hard Sudoku

Set 1xzfg1h. 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 4 5
6 8 5 1 4
1 9 6 7
1 7
9 3 5
1 7 8 3
4
6 3 4 5
2 7
Hard #2
1 3 7
1
7 8 2 3 9
4 8 5
5 1 6
6 5 7 2
9
2 7 4 3
5 1 9 3 8
Hard #3
8 1 7
5 6 9 2 7 3
8 4 6
4 1
3 7 6 2 4
8
3 2 1 4
7 1
9 2 8
Hard #4
6 3
1 5 3 7
6 8
4 9 6 1
3 5 9
6 7 3 5
4 7 1 2
8 7 1 9
8 9
Hard #5
5 1
4 3 2 6
8 9 1
3 9 7 4
7 1 2 9
5 2 8
3 6 8 9 4
6 1 3
3
Hard #6
1 5 2 8
8 6 7 9
3 5 6
9 7 2 4 1
9 4 3
6 7
2 7 1 8
3 4 5
7
Hard #7
1 6 8
9 1 6 7 8
6 3 5
7 5 2 4
7 8 4 3
1 5 9 3
8 5
3 7 5 2
Hard #8
6 7 2
2 8 3 1
5 6 2
4 7
9 6 7 3
7 1 5
8 3 4 2
5 8 9 3
7 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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