Printable Hard Sudoku

Set 4vvrg8. 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 6 4
5 4 8
8 4 5 9
5 8 7 9
9 7 3
3 9 4
2
9 5 2
2 8 3 1 5
Hard #2
3 1
2 1 4
8 4 9 6 3
3 2 1
5 1 8
2 6 1 5 7
9 3
5 7 2 8
3 2
Hard #3
6
6 5 9 8
1 4 5 2
2 3
8 4 6 7 3
4 5 7
8 2 3 4 1
7 3
5 1 8
Hard #4
9 4 5
4 3
5 7 1 9
3 6 5 2
4 2 6
2 6 1
5 8 4
8 2 3
9 3 5 7
Hard #5
2 7 6 9 8 3
1 3 9
7 3 6 5 1 2
1 9 4 8
5 7
6 7
3 4 6
2 9 4
Hard #6
5 3 6
8 9 7
2 9 6 8
8 7 6 3
3 6
2 3 8 9 5
9 1 5
6 1 2
7 8
Hard #7
6 8 3 9
8 5 2 7
2 5
9 1 7 8
4 8 5 3 9
8 2 4
2 5 3
1 9 7
4
Hard #8
3 5 4 2
5 1 9
3 5
8 3 2 5
4 8 1 6
2 6 9 5 8
1 8 4
6 9 4
2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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