Printable Hard Sudoku

Set lileh4. 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
5 6
9 5 2 1 4
2 5 9
2 5 8 4 3
7 5
3 9
1 6 7
7 4 6
4 1 8 7
Hard #2
7 3 9 8
4 6
3 9 2
7 5 8 4
2 3 6 7
6 2
1 9 7
3 6 7
8 5 3 9
Hard #3
2 4 9 6
2 5
8 9 5 3
4 5 7
9 7 4
3 8 1
6 3 1
9 7 6 8
1 9 7
Hard #4
4 3 1 6 7
8 4
6 1
6 9 3 2 8
8
1 4 5 2 9
8 5
7 3 9 1
5 3 9
Hard #5
7 6 9 3
8 5
8 9 7
3 1 4
2 8 9
7 8 1 5
2 1 7 9
5 3 1
6 9 2
Hard #6
3 7
5 3 6
2 8
6 8 4 3 5
7 6 4 8
4 2 7 9
3 2
2 3 4 7 6
5 4
Hard #7
1 6 2
7 3 8 6
9 7 1
6
7 9 4
4 9 2 5 7
6 9 8
6 9 8 4
3 4 7
Hard #8
3 5 9
1
6 3 8 4 5
9 5 8 4
1 6 2
7 5
8 4 2
8 6
2 4 1 6 3 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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