Printable Hard Sudoku

Set 1u505gl. 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
3 8 1 6
6 5 2
2 3 9
7 6 3
4 1
5 9 7 1
5 1 9 7
4 3 9
6 5 2
Hard #2
3 1 2 4
5 8 6 3 9
7 4 9
6 5 1 8
7 1 4 2
3
9 7 2
2 5
4 9 5
Hard #3
3 7 8 6
5 6 2
4 7 1
2 5 7
8 9
7 2 8 5 6
9 2 6
1 6 9 7
4 2
Hard #4
6 3 9 5 4
5 3
5 4 8 6
1 8
7
9 2 5 7
8 5 4 3
7 4 2
3 7 1 9
Hard #5
5 3
7 8 1 2
4 8 1 3 9
5 9
2 7 5
4 3 6
1 3 4 5
7 4
8 1 5 9
Hard #6
8 7 2 5
5 3
1 8
1 7 3 9 2
7 2 9 8 1
8 7
9 2
4 3 8
5 4 3 7
Hard #7
3 5 8 9
8 6 7 2 1
9 1 6 5 4 2
2
9 3
7 3 4
4 1 6 7
8 6 2 1
Hard #8
6 1 9 4
4 9 2 8
2 7 6
8 2 9
1
9 6 3
7 3 5 8 4
6 1
3 4 8 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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