Printable Hard Sudoku

Set 1wma4i4. 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
5 9
1 7
4 3 7 5 2 1
6 8
7 5 4
6 8 5
1 3 2 7 4
3 7
4 8 1 9
Hard #2
2 9 5 3
3 1 6
4 6 2 5
8 6
8 3 7
5 3 8
1 5 8
3 9 1
6 9 8 7
Hard #3
9 2 5 8
2 3
7 1 9
4 6
7 6 2 3 4
2 5 7
4 5
1 8 7 2
7 6 1 8
Hard #4
9 2 1
7 9 4
7 2
6 1 9
3 2 4 7 1
4 8 6
8 3 2
4 5 9 2 1
8 4
Hard #5
8 3
7 2 1 5
4 9 8 2
1 2 5 6
7 8 9 4
1 5 8
9 4
7 6
3 2 5 1
Hard #6
7 8 3 9 5
7
9 1 4 8
6 3 7 9
7 3 4 8 6 2
8 2 4
6 4 5
9 3 1
Hard #7
1 5 9 3
8 9 1 3 2
9
8
3 4 9 6
6 2 8 1 9
9 8 6 7
7
5 7 2 6
Hard #8
9 4 8
8 1 4
1 8 9 7
1 2 5 6 3
6
3 4 8 5 2
2 9 3
7 2
5 6 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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