Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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