Printable Hard Sudoku

Set loocw2. 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 8 7 4
6 8 4
9 5
5 8 2
2 4 3 6
9 4 3 6 5
3
6 8 1
3 9 6 7
Hard #2
9 6
9 3 5
2 9 3 1
5 9 4 6 1 8
6 8 3
3 1 2 7
8 3 6
6 1 5 2
Hard #3
6 1 4 2
3 2 5 6
8 3
7 6
7 9 3 5
5 6 3
4 9 8 1
2 6
8 5 4 2
Hard #4
9 3 1 4 7
8 1 2 6 9
1 6 7 2 3 8
5 6 2 4
3 2 9
8 4
4 5 3
6
Hard #5
9 5 7
6 9 8
7 2
1 2 9 4 6
4 9 2 1
6 1 4
1 3 5 6
7 6 2
5 1
Hard #6
6
6 1 9 2
3 2 8 7 5
4 6 2 8 3
1 2 6 4
2 6
5 6 7
9 7 1
4 8
Hard #7
1 3 2 8
9
6 1 7
3 6 7
3
2 9 8 5 1
9 3 5 2
8 2 5
4 2 9 8 5
Hard #8
2 6 3
7 9 2 5 8
8 3 1
5
8 3 6 9 1
8 6
7 9 4 6 3
4
5 6 1 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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