Printable Hard Sudoku

Set etn2l1. 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 6 9
1 3 6
4 2 5
5 2 4 9
8
6 8 9 5
3 8 1 7
1 5 9 4
8 3 1
Hard #2
7 9 4 1 8
6 4 9
2 8
6 1 4 8 3
7 1 6
8 5 9
6
2 4 1 7
2 3 9
Hard #3
8 7 9
5 8 4
9 2 3 6
7 1 4
4 9 3
4 1 3 7 5
3 2
6 3
8 9 1 7
Hard #4
9 3 6 4
1 9
8 7 1
6 3
2 9 1 8
5 2 6 3
9 6 2
3 1 6 9
2 7 1
Hard #5
3 5 8
9 5 8
4 2
9 4
6 7 8
7 6 5
8 1 7
2 4 5 8 3
5 3 7 2 8
Hard #6
4 8 6 2 5 3 7
3 1
7 5 3 6
9 4
4 7 8 9
1 6
5 4 7 1
1
8 4 2
Hard #7
9 3 6 2
9
5 8
6 2 5 4
9 8 4 7
4 7 1 6
1
8 2 6 1 7 9
7 4 2
Hard #8
7 4 2
8 3 4 7
5 2 9 6
5 6 3
4 6
1 2 9
6 3
7 3 1 5 2
2 8 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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