Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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