Printable Hard Sudoku

Set go883l. 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 4
7 9 2 5 4
3 1 2
4 7 1 6
2 7 9 4 5
8 2 3
3 9
5 6 8
6 1
Hard #2
8 4
4 5 8 7 3 9
7 8 4 1
7 1
4 2
6 4 9 7
6 3 7 1
9 6 5
2 8
Hard #3
3 9
9 8 2
9 8 1
2 6 7
3 1 8
1 7 6 9
8 7 5 6
5 6 8 4
3 1 7
Hard #4
2 8
7 4 2 6
4 1 7
9 4 5 8
7 8 6 9
9 6 2
4 3 2 1
6 2 3
9 2
Hard #5
7 9 1 5 4
3 5 9
4 8
5 7 1
4 5 2 3
2 8 5
1 9 3 6
1 8 9
3 7
Hard #6
1
5 9 6 3
4 2 9
7 6
1 6 4 8 2 3
8 2 7 1
1 7 5
5 4 6
6 8 4
Hard #7
7
7 2
6 9 4 1 8
9 1 8 3 6 2 4
2 3 9 7
5 7 2
9 1
8 5
1 6 9
Hard #8
7
4 6
7 8 6 1
9 6 8
5 2
5 1 2 9 3
2 4 6 3
3 4 6 1
6 2 3 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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