Printable Hard Sudoku

Set 1oilf3r. 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
8 5 3
2 7 3 9 5
4 7 1
1 8
3 2 7 5
7 1 9 2
5 3
4 9
8 1 2 7
Hard #2
7 8 4
7 5
4 6 3 9
6 4 9
2 5
6 5 8 3 9 1
5
7 1 6 2
9 4 7 1
Hard #3
9
1 5 4
1 2 9 8 3
5 8 6
7 4 9
9 3 4 7
7 9 3
5 8 6 1
1 2 7
Hard #4
6 9 4 5
7 6 2
1 9 3
4 8 1 6
2 9
3 1 5 4
8 1 3
2 3
3 2 5 1
Hard #5
8 3
1 5 3 2
6 8 1 9 7
3
4 2 8
2 8 5 9
7 3 8 4
4 5
3 1 5 9
Hard #6
1 3
2 6 9
7 8
7 5 3 4 2
2 8 5 1
4 6 3 9
2 7 4 8
3 8 5
3 4
Hard #7
1 8
1 4 2 7
5 1 6
1 4
5 3 7
8 6 3 5
7 6 9 4
1 9 2 4 8 7
1
Hard #8
1 3 4 8
4 2 9
7 6 1 3
4 3 5 6 9
6 8
5 9
9 7 8 5
1 4 7
7 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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