Printable Hard Sudoku

Set 1l8fyoj. 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 6 8
7 9
1
8 1 7 3
3 4 8 2 1
6 9 7 1 5
6 7 4
7 8 3
9 6 4
Hard #2
6 9 7 8
7 4 6
4 5 9 2 1 7
9 6 4
5 3 1
8 5 4 7 6
5 8 4
1 2
Hard #3
5 7 9 6 2
1 7 8 4
9 8
8 6 3 2
9 7 3 5
3 8
9 2 3
2 4 5
9 1
Hard #4
7 6 9 4
6 8
5 9 7 8
4 8 5
3 1
8 2 5 4 9
8 4 9
9 2 7 8
1 7
Hard #5
1
1 5 6
2 6 8 4
3 1 8 6 9
7 3
7 1 9 8 6
1 2 9 8
3 9 4
9 8
Hard #6
7 9
9 5 3 4
4 2 3 7
2 1 7 5
1 3
5 6 2
6 2 5 3 8
7 9
5 1 4
Hard #7
2 8 9
3 2
4 7 9 3
9 3 4 1
6 1 4 3
3 1 8 6
6 5 9
1 4 7
8 3
Hard #8
9 6 7 2 3
1 6
4 5 8 6
6 9
3 7 9
3 1 2
9 1 4 5
8 7 3
7 6 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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