Printable Hard Sudoku

Set 1ivo928. 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
1 3 2 5
8 4
1 8 3 6
5 2 8
7 5 4
1 6 9
7 2 5 6
8 4 1 7
1 2
Hard #2
5 4 7
7 1 3
8 9 3 1 7
2 6 8 3
3
3 1 4 2
8 1 3 2
6 8 1
9 5
Hard #3
2 5
9 6 7 2 4
3 7 6
5 2 9
3 8 6 4 9 1
8
1 6 5 9
3 7 1
9 5
Hard #4
7 6
5 3 7
2 1 3
1 4 2 5 6
2 6
4 7 9
4 2 8
6 8 3 7
8 7 3 5
Hard #5
2
2 4 7 8
8 3 5 2 4
4 2
9 1 5 3
2 3 9 6
7 9 6
1 5
6 5 2 7
Hard #6
4 8
1 6 4
2 6 7 8
9 4 7
6 3 9
7 1 9 3 6
8 1 7 4
7 3 5 9
2
Hard #7
1 9
3 7 1
6 5 3 2
2 7 3
8 5 3 9
4 7 8 5 2
6 3 8
7 1 9 3
2
Hard #8
5 3 9
9 4 3
9 5
7 3 8 9 5
1 5 7 6
2 5 7 6 3
5 6 1
7 2
1 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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