Printable Hard Sudoku

Set lkw30j. 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
6 5 8 4
1 6
1 2 4
1 5 3 7
9 8
4 6 9 3
2 6 5 9 3
7 3 4
4 2
Hard #2
3 7 8 1
2 4
5 9 6 3
7 4 1 9 6
6 9 5 7
3 4
1 7 9 5
6 1 2
9
Hard #3
6 4
6 8 2 7 1
7 2 3 6
1 6 5
3 8 1
5 4
9 5 1
1 9 3 4
2 8 7
Hard #4
1 4 3
8 9 6 4
7 5 9 6
3 8
1 8 5 2 9
7 2
6 1 7 8
4 2
3 7 9
Hard #5
1 4 6
2 7 1 6 5
1 2
3 7 6 4 8
5 3
3 9 4 6
5 7 8
8 5 4
4 9
Hard #6
1 7
9 6 5 1 7
7 4
6 1
5 3 6
7 4 9 3
6 2 3 7
6 2 4
1 7 5 6
Hard #7
5 9 8 7
8 1
1 6 5 3
8 6 9 4
3 9
9 7 8 6
5 4 9 3
2 7
2 1 6
Hard #8
2 3 9 1
2
1 2 7 6 9
2 4 5
9 3 7 8
8 5
6 9
4 2 6 1 3
8 4 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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