Printable Hard Sudoku

Set v4htra. 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
5 7 1
3 5 4
6 4 5 8 3
8 5 6
4 1 5 3
6 4
5 6 2
1 3
6 3 2 7
Hard #2
5 7 1 8
1 4 9 6
6 9
2 1 9 8 5
5 3
5 1
3 2 1 4
5 2 8 7
6 4
Hard #3
4 9 8
3 7 4
7 2 8 1
9 8 2
3
3 9 1
2 8 4 3 5
6 1 8
7 6 1 2
Hard #4
9 2 8 5
1 3 5
2 1
2 3 9 4 1 7
8 4 3
5 7 2
6
7 2 6
6 4 7 8
Hard #5
7 6 1 9
9 8
8
9 5 4 6
8 5 4
3 2
8 2 4 7 6 3
9 1 3
6 2 1 5
Hard #6
9 1 5 8
3 4 6
2 7 4
8 2 5 3
5 8 1
6 5 7
6 1 4
4 2 7 6
6 9
Hard #7
2
3 5 4 8
7 9 3 1 5
9 6 2 4
6 5 3 8
5
1 3 7 4 2
4 1
3 5 7
Hard #8
2 8 5
1 7
9 4 3 8
3 6 2 1
8
8 7 1 6
3 1 2
7 8 9 6
6 4 3 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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