Printable Hard Sudoku

Set 16uw8kc. 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
2 1 5 4
8 1 2 3
6
6 4 9 1
1 9 8 3 4
7 8
3 1 5 8
7 6 2
2 7
Hard #2
4 6
2 7 3 4 9
5 8 7 6
2 7 6 8
8 3 6 4
4 1 9
7 5 1
4 2
8 1
Hard #3
6 3
3 9 4
4 7 5 8 3
8 9 1
5 1 2 7
7 9 8 2
4
8 5 6 1 3
3 2
Hard #4
4 6 1 8
1 8 2 7
2 5
6 2 4 9
5 7 4
1 8
7 9 4
3 5
1 6 5 2 8
Hard #5
5 8 4
3 7
2 7 1
4 2 8 7 5
9 2 6
2 4 3
9 6 5
5 9
4 8 1 7 2
Hard #6
5 4 9 3
8 2 1 9
9 2
1 4 2 7
3 9 7 4
8 6 9
8 1
7 8 5
9 4 6
Hard #7
2 7 3 9 8
5
5 8 4 1
3 2 6 4 8
9 8 7 2
1 5 4
2
3 1 7
4 5 1
Hard #8
9 6 4 7
6 8 3 9 5
2 1
3 4 1 7
2 4
2 9 8 5
8 4 9 1
3 7 8
1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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