Printable Hard Sudoku

Set 49o4w3. 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 9
9 4 5
9 4 8 1
8 4 2 7
1 6
7 4 9 5 2
8 6 5 9
2
2 1 7 8
Hard #2
5
8 6
8 9 6 2 7
1 5 4
1 6 3 8
4 6 1
5 4 7 6
1 8 9 2
2 9 8
Hard #3
4 1 2
1 3 7 9
9 2 6 4
9 8 7
7 2 1
2 6
2 1 9 8
6 4 2 5
5 6
Hard #4
1 9 2 8
6 5
3 6
9 8
6 5 4 9
7 4 9 6 8
7 6 9
4 9 5 2
4 8 7
Hard #5
4 1
3 1 8 9 7
2 6 8 5
7 1 5 9 4
2 1
9 5
5 6
5 6 7 2 4
5 3
Hard #6
3 4 9 8
4 3 5
4 3 1
8 4 2
9 8 4
8 2 3 7 6
5 6
1 9 5 3
7 9
Hard #7
8 7 6 5 1
3 9 8
5 2 3 8
5 4 2 6
7 9
6 1 7 9 2
4
9 3
6 7 2
Hard #8
3 1 4 5
9
5 7 2 1 9
6 1 4
2 9 5 8
8 3
9 5 2
6 5 9
5 7 3 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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