Printable Hard Sudoku

Set uw7cc2. 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
6 1
4 9 2
5 1 6
6 7 3 5
7 6
8 6 1 7 9
7 5 2
8 9 4 1
4 1 3
Hard #2
1 3 8 5
6 4 3
5 3 6 1 4 9 7
4 8 6 3
9 8 1
7
4 8
3 9 5
5 2
Hard #3
8 2 6 4
4 8 9 6 1 2
6 3
1 8 5
7 1
9 8 7
9 7 1
7 3 9
4 6 3
Hard #4
4 7 6 5 3 9
3 6
8 7 4
8 9
3 9
8 9 2 5
1 2 8
6 3 7
2 3 4 1
Hard #5
5 1 2
8 5 6
2 3 9 7 8 5
2 4 9 6 7
1 4 9
1
8 6 7
2 6 5
9 2
Hard #6
1 5 3
4 7
4 1 8
8 5 4 1
7 1 9 8 5 6
6 9
3 2 9 8
5
5 3 2 6
Hard #7
2
8 5 1 7
4 9 6
5 2 6
6 1 4
9 7 6 8
1 6 9 8 2
2 7 3 5
5 1
Hard #8
1 6
9 4 8 6
2 9 4
4 8 5 6
7
7 9 5 3 1 8
6 5 7
2 4 8 7
8 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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