Printable Hard Sudoku

Set 1g9df1u. 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 8 5 3
4
1 5 7 8
6 4 9 2
8 6 3 5
2 3 8 4
9 2
3 1 2 7
3 4
Hard #2
6 7
9 5 2
1 9 7 4 6
4 6 7 2
9 6
3 2 1
3 8 7 9
5 8 9 3
6 4
Hard #3
5 2 6
7 5 6 8 4
9 2
7 3 5
9 8
1 4 8 3
9 2 6 7
4 9 1
8 3 2
Hard #4
9 8 2 4
9 7 5
5 4 9 2
6 3 7
9 5 4 1
7 4 1 8
2 8
8 3 1 4
9
Hard #5
7 4 2
4 8 7 6
6 3
5 7 8 2
9 2 1 5 7
1 5 6
3 4
9 1 7
7 8 1
Hard #6
7 5 8
3 2 8 9
4 8 6
7 5 4 2
6 3
3 1 8
2 1
1 9 5
2 9 5 1 7
Hard #7
4 8 2 1 6
2 3 4 7
7 1
6 4 1 2
4 3
2 9 4
3 9 4 7
2 8 3
5 9
Hard #8
7 6
4 6 7 1
1 5 2 8
4 1 5 8
9 5 6 2
7 1 9
5 4 6
2 8 1 9
4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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