Printable Hard Sudoku

Set 1l5sfpb. 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 1 5
3 7 6 2 8
4 3
7 3 1 2
8 4
4 9
2 7 3 9
7 9 6 5
1 4 6
Hard #2
5 3
4 9 7
3 5 2 8
3
1 5 4 6 2 8
8 9 1
5 1 4 6
9 8 4
7 6 5
Hard #3
2 6 4 1 9 8
6 1 5
9 8 6 2
5
1 9 6
3 1 4
8 1 5 3 9 6
7 8
9
Hard #4
5 7 2 9 6
1 5 9
2 6
3 2 5
7 1 8 4 2
1 8 7 5
6 7
4 8
8 3 7
Hard #5
8 4
7 6 8 5
3 5 1 6
1 6 9 3
2 8 7 4
4
9 3 6 1 2
2 7 5
4 7
Hard #6
3 9 8 2
7 4 3
8 2 6 5
5 4 1
6 3 2 8 5
2 6
5 7 8
9 6 1
4 6
Hard #7
6 3
4 2 7
7 5 1 4 9
2 4 1 7
4 2 5
5 8 7 6
1 8 3
8 9 7
4 6
Hard #8
8
2 7 3
9 7 8 5 4
7 9 3 2 4
5
3 6 7
8 6 4 3 2
1 3
5 6 8 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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