Printable Hard Sudoku

Set vsb1fa. 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
8 9
9 8
6 8 1 4
1 9 2 5
5 7 8 3 9
3
6 2 7
9 4 6 2
7 3 5 8
Hard #2
2 7 4
5 1 3 6
9 4 3 2
2 5 8 7
4 1
3 7 9
4 3 5 1
9 8
8 7 5
Hard #3
7 3 2
3 7 4 5
6 8 5
5 4 7
8 7 2 3
9 2 1
9 2 5
9 3
3 8 7 4
Hard #4
3 6 4 8 1
9 1 4 3
4 3 6 5
9 7
2 8 7
6 2 3
2 3 5
9 1 4 6
8
Hard #5
2 1 9 8 7
4 8 2 6
3 6 2 5
7
9 3 4 1
5 8
8 1 6 3 5
5 2
9 5
Hard #6
7 5
1 7 5
6 2 8
5 9 4
5 4 8 3 2
6 1 4 7
8 5 9 3
6 3 1 7
5
Hard #7
6 3 5
8 4 2 7 6
1 7 8
8 2 5
9 7 3
3 4 2 7
9 5 2 7
1
4 3 6
Hard #8
5 4 3 2 1
9 4 3
6
8 6 5
9 3 5
2 6 8 4 7
4 1 7
1 2 6
6 1 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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