Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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