Printable Hard Sudoku

Set qoww5k. 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 7 9 4
5 7
1 8 9
4 2
4 3 6
8 1 6
9 2 8 7 1
3 8 5 2 1
5 3
Hard #2
8 2 6 4
1 9 5
2 1 6 3
7 4 9
8 6 7
9 2 7
9 8
7 5 1
4 6 7 8
Hard #3
8 2 6 3
4 8
8 5 7
1 7 3 4 6 9
8 1 4
2
2
4 8 1 5
9 8 2 6 7
Hard #4
1 2
5 9 3 8 4
8 9 4 6 5
3
9 7
1 3 5 6 8
3 1 7 9
6 8 2 7
2
Hard #5
5 2 9 8
3 1 5 7
9 6
9 1 3 6
6 7 4
2 7 9
1 5 8
5 6
1 3 2 4
Hard #6
8 4
9 2 5
7 4 8
9 6
5 7 9 4
3 4 2
1 7 2
6 8 9 5 1 3
3 6 8
Hard #7
9 2
3 7 9
5 8 3 2
6 3
4 2
8 1
6 9 4 5 7
2 7 8 5 1 6
9 6 2
Hard #8
1 4 2 7
6
7 6 4 1 3
1
8 3 7 6 2 9
5 2 4 1
4 9 3
5 8
3 9 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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