Printable Hard Sudoku

Set smnd5j. 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 2 7
4 7 1
5 7 3
8 9 5
4 2 1
6 5 4 9 3 7
8 1 6
2 9 4
9 4
Hard #2
4 8 2 5
2 9 6
7 9 6 3 8 4
6 3 5 2
1 3
7 5
2 5
9 8
2 8 7 1
Hard #3
3 2 9 6
9 5 7
8 6 9 3 1
6 9
8 4 7
5 3 8 6
2 8 4 9
3 7 2
4
Hard #4
5 6 7 1
2 5 4
3 4 9
2 5
9 4 8 2
1 2 9 4 7
6 7 1 5
3 4
8 1
Hard #5
4 3 2
3 2 7 1 5 6
8 2 4
9 3 1 8 7
1 9 2
4 7
1 6
1 9
5 6 1
Hard #6
9 7 5
2 6 4 3
8 1
3 2 4 9 7
1
2 3 6 4 5 8
3 4 2
4 8 5
1 6
Hard #7
4 2 5
7 6 9
2 7 6
1 2 7
4 6 1 3
3 7 5 1
7 2 4 3
6
8 1 3 5
Hard #8
5 3
3 8
6 9 7 1
1 7 8
2
9 1 6 5
6 4 3 8
7 1 2 5
9 2 3 4 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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