Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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