Printable Hard Sudoku

Set 1l3twl6. 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 7 6
6 8
9 5 4
2
7 2 3 8 6
9 5 4 1
5 3 4 6
7 8 9
2 9 3 7
Hard #2
2 6 1
4 3 7 2 8
4 8 7
8 5 6
3 9 8
8
3 5 2 9 4
1 6 9 2
4 2
Hard #3
3 9
2 6 5 3
5 1 6 7
7 1 8 2
3 4 9 5
9 2 5
8 6
7 8 4
7 5 8
Hard #4
4 3 9 5 1
9 8 1 6
4 7
6 2 8
4
1 2 6 7 5
1 6 4
5 6 3
8 2 3
Hard #5
7 6 5 2
8 2 3 6 1
4
6 2 8 7 9
3 6 2
2 4
8 6 3
6 9
9 4 1 5
Hard #6
7 9 1 4
3 2 6
2 5 4
7 8 9
4 3 2
8 9 1
1 6 5
8 3 9
5 7 9 8
Hard #7
2 9
8 3 4 5
9 4 8 6
4 1 9
3 5 2 6 8
8 2
8 4 1
4 6
8 3 1 2
Hard #8
5 9 1
7 4 2 5
6 7
5 4 8 3 7
1 7
8 2 3 9
6 3
6 1
9 8 3 5 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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