Printable Hard Sudoku

Set 1ki2f6m. 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 4 5 2 3
3 4
8 6 7 9
1 9 3
8 7
1 4
7 5
6 5 4 8 7
7 3 9 2
Hard #2
2 5 9
8 1 3 9 4 2
4 7
4 6 5
3 8 1 9
8 1 5
6 8 4
5 3
7 9 1
Hard #3
7 4 8 6
8 5
8 5 7 9 1
9 1 5 6
8 2 1 7
2
9 6 5
2 1 3
5 6 4
Hard #4
8 3 4
9 7 2 8
7 2
9 4 8 6 3
6 9 5
3 1 6
9
8 2 3 4
4 5 2 1
Hard #5
6
7 1 4 2 8 5
6 9 1 3
2 6 8
1 4
7 5 2 9
2 3
8 5 2 6 1
5 4
Hard #6
3 8 9 1
7 5 6
4 5
5 6 3 7
4 1
3 2 8
7 8 1 5 3 9
7 2 5
1 7
Hard #7
4 5 9
7 9 5 2 6
7 3
7 5
1 6
2 1 6 9
1 5
8 5
3 5 9 8 6 1 2
Hard #8
1 9
4 7 3
8 9 4 1
6 4 8 2
9 5 7 2 8
4 3 6 1
1 6
1 8
6 9 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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