Printable Hard Sudoku

Set i3jsyu. 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
4 3 5
5 2 4
2 8 7
6 3 9
7 8 2
1 5 6 3
1 7 6
5 9 1 7 4
8 6
Hard #2
7 2 4
9 5 7
6 7 8 4 5
3 6 2 7
8 5 3
7 5 8 2 1
9
7
8 3 1 5
Hard #3
8 3 9 2
2 7 4 6
1 9
7 2 8
5 7 6
8 6 4 3 1
1 7
6 4 5
5 8 9
Hard #4
8 6 2
5 7
1 7 2 4 8
4 1 7 9
6 9
5 4 1 6
6
7 6 2 9 4
5 4 2
Hard #5
6 4 8 2
3 7 1
2 1 3
7 5 2
1 7
4 5 8 3 1
4 3 9
5 6 4
8 1 2
Hard #6
5
9 7 3 1 4
4 6 7
7 6 9
8 9 7 3
5 3 9 7
4 1 9 2 5
6 8
2 8
Hard #7
6 4
7 9 6
5 8 3 9
2 3 8 7
6 7 9 5
8 4 3
7 1 2
8 4 1
1 4 7
Hard #8
1 2 3 7 4
6 8 1 2
9 7
2 5 7 4
3 9 5 7
8
9
4 3 2 5
8 7 6 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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