Printable Hard Sudoku

Set 60u4ub. 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
8 9 4 2
2 1
4 9 7 6
2 7 1 5
7 4 8 3
5
4 6
3 9 4 7 2
8 3 4
Hard #2
1 2 7
8 2 9 5
3 7
9 3
7 8 4 5 1
1 2 9
6 9
2 5 6 8
1 3 9 5
Hard #3
1 2 9
8 3 1
7 2
2 8 7 4
8 4 5 2
6
3 8 5
9 4 2 8
5 1 3 8 6
Hard #4
9 2 1 6
7
5 2 8 1
9 6 1 5
1 7 8 9 2
6 4 7
2 4
8 5 3
3 6 9
Hard #5
7 9 8 5
2 9 4
3 5 7
1 3 2
3 9 7 4
1
7 5 8
1 9 5
2 9 7 3 4
Hard #6
9 8 1 3 5 2
4 9 6
6
7 1
8 1 5 9
2 9 3 7
2 8 6
1 6 2 3
1 4
Hard #7
8
3 2 7
6 2 3 7 8
9 4 2 8
2 6 5 9
8 9 5 7 1
9 3
3 8 1 6 9
Hard #8
8 9 4 7 6
4
4 6 9 5
6 9 8 7
9 2
2 8
6 3
2 1 9 4 7
1 3 9 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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