Printable Hard Sudoku

Set km0x4r. 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 5
5 4 2 6
3 2 4 9
4 6 7 1
5 3 4
6 1 9
3 9 5
1 6 4 2
2 9
Hard #2
5
3 6 8
2 6 7 3 1
1 3
1 7 6 4 2 3
4 1 2 5
9 5 3
6 3
8 1 7
Hard #3
7 4 3 8
9 1
6 4
1 9 6
8 4 1 7 2
6 3 4 1
4 2 9
8 7
3 5 2 1
Hard #4
7 2 3
4 9 7 8
3 5 6 2
1 3 5
2 5 7
6 9 4
3 6 1
2 3 5 8
8 4
Hard #5
1
1 3 4
8 5 2 7
6 2
7 5 2 9
3 9 4 6
8 6 4 7 2
8 7
3 1 4 5
Hard #6
5 9
9 4 8 1
2 7 6 8
4 6 3 1
7 6
1 9
3 2 6 5
4 5 9 1 7
2 3
Hard #7
7 2
8 9 7
2 1 8 5
8 9 4 5 7 6 3
2 3 9
7 8
6 7
5 9
6 3 2 5
Hard #8
6 4 7 9
9 3 5 4 1
9 5
3 5 2 7
4 1 2
5 1
4 8 7
3 2 8 4
7 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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