Printable Hard Sudoku

Set 16uxugu. 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
6 2 1 3
7 5 4 8
3 9
2 5 9
9 1
9 5
5 7 2 1 4
8 1 7 6 3
3 8
Hard #2
3 6 2 9 7
9 5 4
2 3
4 6 7
7 2 8
7 6
3 1 8 7
6 1
2 4 5 3 1
Hard #3
8 3
1 8 2
7 3 6
1 3 4 7
5 6 1
4 5 2
6 1 4 5
5 9
2 5 6 7 4
Hard #4
5 7 2 4
6 3
1 8 9
9 6
1 7 4 3 8 2 5
5 1
9 2
8 7 4 5
2 6 9
Hard #5
9 3
1 6 9 4
7 9 1 5
8 4 1 2
4
6 4 7 3
5 3
4 2 6
4 3 8 5 9
Hard #6
3 6 8
1 5 7
2 9 4 7
5 7 1 6
8 1 4 6 2 3
2
2 3
2 6 4 5
1 9
Hard #7
7 1 9 3 8
2 4 5
4 1 9
7 5 8 6
1 7 3 5
6 8 9 2
2 4 1
9 3 6
Hard #8
7 5 8 1
9 3 4 8
9 7
7 6
2 3 6 9 1
4 8 1 6 5
9 8 4
4 7 3 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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