Printable Hard Sudoku

Set 1uvie37. 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 3
8
5 1 4
7 4 2 3
9 3 8
3 6 1 7 2
4 6 2 5
8 3 2 6 4
7 9
Hard #2
7 1
6 5 4 8
2 3 9
9 5 7 4
1 2 3 6
1 4 3
6
4 1
1 7 2 9 6 3
Hard #3
4 7 5 1
1 5 9 6
2 8 5 4
2 5 6 3
7 3
9 7 4 5
2
5 6 9 8
9 4
Hard #4
7 8 4 6 5
4 9 1 7
6 4
9 6 5
6 2 4 8
3 9
6 1 9 5
4 5 2 6 1
Hard #5
7 3 5 2 9
5 6
2 5
7 3
6 5 2 4 3 8
1 9 4
6 8 4 7
8 5 7
2 6
Hard #6
7 9
9 5 8 4 1
1
7 6 5
7 3 9 4
4 8 1 3
9 3 7 4
1 5
7 2 5 3
Hard #7
6 2 8 9
2 1 8 5
3 6 1
9 2 1 7
5 3
8 7 6
7 6
8 5 3 4
4 9 8
Hard #8
7 9 8
1 3 4 7
8 7 6 3 1
2 6
1 5
8 1 2 9
4 2 1 3 8
6 3 5 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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