Printable Hard Sudoku

Set gvkf6f. 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
9 8 6 4
8
7 2 1 5
1 4 8 2 5
4 3 1
6 5 8 7
2 3
9 3 6
5 1 8
Hard #2
4 1 9 7 5
7 5 6
9 5 7 2
5 4 7
8 9
2
9 7 4
3 5 4
4 5 6 9 2
Hard #3
9 7 3 5
1
5 1 4 2 9 3
3 5 4
8 7 5 6
6 3 8
5 9 2
2 7 6 8
3
Hard #4
2 5 7 6 8
8 6 4 5
7 9 2
6 4 2 5
1 2 6
3 8
3 9 6 7
5 8
9 3
Hard #5
8 7 6 9 2
7 2 4 1 6
9 5
1 6 7 8
2 3
8 3 9 6 5 1
1
9 2
8 7
Hard #6
4 8 6
7 2 5 4
1 3
8 2 6
5 2 9
9 8 5 4 7
4 6 5
5 9 7
3 8 9
Hard #7
8 7 5
7 6
3 4 2
5 9 3
7 2 1 8
4 6 7
5 6 9 3
2 3 5
1 6 3 4
Hard #8
5
5 4 8 9 3
6 3 4 2 8
2 9 1 8 7 6
7 9 2
8 5
2 7 1 4
9 3 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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