Printable Hard Sudoku

Set vpub4m. 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 1
3 9 8
6 2 7
9 2 6
7 3 1 4
4 7 8
2 6 8
2 1 4 5 9
4 3 5
Hard #2
5 1 8 6
8
6 2 4
5 2
6 5 3 9 8 7
9 1 6
9 3 5
6 7 1 3
2 3 1
Hard #3
1 9 3 4
6 5 9 8
7 6 5 4 1
3 6 1 5
8 9
3 9 1 8
8 3
2 9 7 4
Hard #4
6 1 8 4 2
8 3 2 1 6
2 6 9
7 3 1
1 9 5
7 1 8
6 3 9 2
2 8 1
Hard #5
9 7 5
6 8
4 6 9
4 5 3
6 3 1
6 7 1
1 5 7 2
4 3 5
7 4 8 5 6
Hard #6
2 8 3
5 7
6 7 1 8
1 3 7 5 2
2 5 9
7 9 1
2 1 8 7
4 5
1 9 6
Hard #7
6 5 3
2 9
4 7 6 5 1
6 7 9 3
3 9 5
1 8
1 2 6
2 6 5
8 3 2 4
Hard #8
6 2 3 1 5
3 5
7 1 4
4 5 7
8 3 9
4 7 1 2
9 1 6 5
2 5 9 8
2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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