Printable Hard Sudoku

Set i0zdpw. 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
8 9 4 5 7
3 2 9 5
1 7 9 2
8 7
9 6 5
3 7 2
4 5 3 9
9
3 6 4
Hard #2
6 9 3
4 8 9 5 6
2 4 8
7 4 3 6
5 9
7 5 2 6 1
8 1 7
2 3 4 7
Hard #3
7 3 4
6 8 3
9 4 1 6
5 6 9 7
9 6 1 7
2
6 2 3 1
9 4 1 7
4 3
Hard #4
2 6 1
8 6 4
5 1 3
2 3 7 9 4 6
5 4 8
5 6 9 2
1 3 8 5
2
6 3
Hard #5
7 4 1 2
8 3 9 6
6 2 3
1 4
6 7 3 8
2 7 3
5 9 8 6 4
3 7 1 9
Hard #6
7 3 5 1
1 4
5 7 1
4
6 7 9 1
1 2 3 6
9 8 5
1 2 7 6 8
3 4 2
Hard #7
9 3 5 4
1 8 2 3
1 8
9 4 7
4 1 3 5 8 9
6 7
8 7
5 6 2 1
4 1
Hard #8
5 8 4
4 9 2
2 8 1 5 6
5 6 2 3
9 3 7
4 7
7 6
7 1 8
8 4 7 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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