Printable Hard Sudoku

Set 1um3sko. 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 5
7 5 8 1
3 8 9 2
6 5 3
1
8 7 1 9
5 4 8 1
2 5 4 7
6 8 3
Hard #2
6 2
3 5
9 5 4
9 2 6 7
3 4 1 8
6 8 9
7 6 5
4 5 3
9 2 8 4 6
Hard #3
8 3 1
6 2 3 9
2
7 5 3
5 8 3 4 9
6 2
2 9 7
8 4 5
7 4 9 2 6
Hard #4
6 1 8
4 1 2
9
7 4 1
8 9 6 5
6 4 5 1
9 7 6
8 3 7
5 4 8 9 6
Hard #5
5 6 2
5 2 9 4
9 8 7
4 7 9 8 1
1 3 5 9
8 1 7
2 9 5 7
9 4 8
Hard #6
6 3 2
5 3 1
4 8 7 9
2 5 4 8 3
6 3
2 8 7
6 4 1 8 7
2
7 6 4
Hard #7
8 1 6
9 5
1 6 7 9 4
3 2 9 4
8 4 7 3
1 5
5 2 4
8 4
2 7 3 5
Hard #8
2 4 9 6
1 5
6 5 7
9 1
8 4
3 1 2 8
1 8 2 5 3
2 5
5 3 6 9 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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