Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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