Printable Hard Sudoku

Set 2gfm4e. 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
1
7 5 1
9 8 7 6
1 5 2 9 4
6 3 9 8
4 2
8 6
9 7 5
8 4 3 2 9
Hard #2
3 9
8 3 1 4 6
9 5 8
9 5 1 6
8 2 5 6
1 7
5 9 4
1 3
4 2 6 8
Hard #3
4 6 1 9 2
6 5 8
2 5 9 6
9 8
1 9 6 7
2 8
9 8
4 9
7 9 1 3 4
Hard #4
2 4
3 8 5
1 8 7 9 2
7 8 4 1 6
9 2
3 1 9
6 9
4 2 8 3
2 3 7
Hard #5
4 8 5
3 9
1 2 3
8 4
1 4 3 8
3 7 9
1 4 5 8 9 6
5 3 4 2
2 6
Hard #6
4 7 9
3 9 4 1 6
3 2 1 8 4
8 2 1 3
4 7
1 7 6
9
6 1 8 5
5 3
Hard #7
5 7 2 6 9
4 7 3
3 9 5 4 2
3 8 4
6 2
8 7 5
3 4
5 7 8 1
6 5
Hard #8
9 1
7 4
6 7 4 5 3
9 2 3
3 4 2 7
1 8 2
8 2 3 5
6 9 4
4 5 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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