Printable Hard Sudoku

Set 1cu4bjq. 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
9 8 1 4 7
2 9
5 4
4 5
6 7 3
3 8 6 2
7 6 5
3 6 2 5
4 5 8 1
Hard #2
8 4
7 2 1 4
1 3 9 7
1 6 2
6 2 3
8 1 3
3 4 5 8
8 9
1 2 7 6
Hard #3
9
8 1 7
9 2 5
1 2 9 3 6
7 1 9
5 8 1
5 4
6 4 8 1
2 6 8 5 9
Hard #4
8 1 9
7 3 6
9 4 2 3
3 2
4 7 8
2 1 7 8
1 9
9 2 4 1
6 3 5 8
Hard #5
8 6 7
5 7 3 2
1 6
8 3 4
8 3 6
4 7 9
9 3
7 3 1 8 2 5
1 5 6
Hard #6
1 4
3 8 4 5 1
6 5 8
1 9 7 5
8 9 1 2
4
3 8 4 1
1 7
9 1 6 3
Hard #7
4 3 8 5 7
1 6 8
5 9 3
9 1
5 4 8
2
9 3 7 1 2 6
8 6 4
6 1 4
Hard #8
4 8 9 2
4
6 1 5
8 2 5
4 9 1 7
1 8 3 7
7 6 1
7 2 4
5 6 3 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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