Printable Hard Sudoku

Set 1vi4x0r. 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
2 4 7 6
7 8 4
5 2
6 4 5
2 3 6 9 7
1 9 3
2 7 3
1 3 5 8
5 4
Hard #2
1 4
2 5
4 3 8 6 7 9
4 3 7 5 6 1
5 8
6 3 4
7 5
7 8 3 2
1 4
Hard #3
9
4 7 9 5 3
6 3 7
1 4
4 3 7
6 5
1 7 8 4
2 3 6 1
7 4 9 2 5
Hard #4
1 9 4
4 8 6
3 6 9
2 1 8
1 7 3 2 6
5 8 1
9 7 3 4
3
7 2 8 9
Hard #5
6 3 5 9
5 4
8
9 8 4
2 1 7 9
3 4 5
5 6
1 3 9 5 7
9 6 2 8 4
Hard #6
8 6 4 3
1 5
5 3 1 8
3 4
4 5 7 6 1
6 1 7
9 3 5 7
5 6 7
2 3
Hard #7
8 5
3 9 2 1
1 2 4 8
6 3 9 8
7 3 2
1 9
7 8 5 2 1
6 7 5
9 1
Hard #8
3 1 8 4 5
6 9 1 5
8 6 4 1 9
6 5 3 1 2
1 8 6
4 7 3 1
4 9 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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