Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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