Printable Hard Sudoku

Set 18li28o. 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
3 5 4 1
7 1 3
1 7 5 9
9 6 2
2 9
3 7 6 2 5
2 4 7 3
8 5 4
8
Hard #2
8 6 9 1 7
9 2 8
1 5 2
3 9 2 5
6 3
2 7 4
5 4 7
4 3
1 7 6 9
Hard #3
5
1 3 2
6 2 8 4 1
4 6
5 7 2 3 9
3 1 9 2
2 6 1 4
3
4 3 9 7
Hard #4
4 7 6
3 8 2
7 9
5 8 2
2 9 7 6 3
6 5 2 9
1 9 2 6
1 8 4
6 1
Hard #5
3 1 8 6
2 9 7 3
4 2 9
9 3 6
4 9 2
5 6 4
5 1 8
5 7 3
1 5 9
Hard #6
8 6
4 6 7
2 5 8 9
7 8 3 9 4
5 2 6
1 9 3
2 1 9
9 6 7
1 8 5
Hard #7
7 5 6 2 1
4 3
3 8
6 4 7
7 2 9
1 5 6 8
6 2 9 8
7 5
9 1 3 4
Hard #8
2 4 5 7
1 5 8
5 8 3 1 4
3 4 2 6
1 9 5
2 8 3
3 2
7 3 1
5 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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