Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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