Printable Hard Sudoku

Set 1ucl67e. 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
7
7 3 4 5 9
5 2 1 3
2 6 4
8 6 5 9
3 7 2 8
6 1 3
8 9
2 1 5
Hard #2
1 4
3 8 2 5
5 4 6 9 8
4 5
8 1 7
7 5 6
8 1 3 2 6
6 3
7 1 4
Hard #3
9 5 7
5 7 2 8 3
7 4 1 3 5
9 7 6 4
8 4 6
2 6 9
1 2 6
5 6 1
Hard #4
9 4
9 7 1 4
2 8 9
9 3 1 6
9
6 5 3
5 9 1 8
8 7 2 3 1
9 8 7
Hard #5
3 4 8 9
3 4 1
8 1
3
2 5 1 6
9 7 1 8
1 4 5 9 3 2
6 3 2 8
7
Hard #6
8 5 7 9 3
2 8
9 3 6 2 7
1 3 8
7 1 8 4
5 4 6
7 6 5
6 5 8
2
Hard #7
6 8 9 2
3 1 2 8 7
5 7 1 6
8 3 2
5 4 1 3
4 7
1 5 4 2 7
2
9
Hard #8
3 9
6 4 8
4 7 1 2
7 2 8 4 5
5 6 4 9
8 6
4 3 1 5
6 1 5 7 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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