Printable Hard Sudoku

Set wi6543. 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 2
7 1 2
8 3
4 5 1
8 1 4
9 6
1 6 8 4 2 3
5 7 6 9 4
4 1 7
Hard #2
2 8 1
8 4 2
4 5 7
7 6 5
6 9 2 7
3 2 1
1 9
9 2 8 5
1 4 3 2
Hard #3
8 2 6 4
9 8 5 3
7 5 3 6 1
5 3
4
8 1 3 6 7
4 2 1
6 1 2
5 8
Hard #4
9
4 1 3
7 5 4
2 1 3
8 6
8 4 1
6 3 9 8 2
7 3 1 5
2 4 7 9 3
Hard #5
7 6 8 2
3 9 5
9 6
4 7
1 3 4 2
8 7 1
1 6 2 8 4 9
9 8
8 6 1
Hard #6
7 3 1
7 3 4
6 5 1 2
7 1 9 5
8 5 7
1 2
1 8 3
9 2 8 1
6 8 3
Hard #7
2 1
1 8 2
4 7 8 9
4 5
6 1 4 8 3
9 8 2 6 3
3 5 4 6
2 6 7 4
Hard #8
1 2 8
8 3 9 1
3 6
9 2 7
4 5
1 5 2 8
4 9 5
7 6 1 9 4
3 8 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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