Printable Hard Sudoku

Set ez50hj. 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
7 4 2 5
5 9
8 7 6 2
3 4 7 8
7 1 3
6 9 1
4 7 5
3 4 1
2 6 5
Hard #2
7 4 3
4 6 8 2
5 3 6
7 6 2
6 9 4 7 5
8 4 5
9 1
2 1 6
5 8 3
Hard #3
7 4 1 5
6 2 8
1 7
8
1 2 9 7
9 3 4 6 8 5
9 2 4
4 1
3 9 8 6
Hard #4
6 8
8 9 1 3 7
4 9 5 6
5 1 9
6 3 2
5 7 2 4
1 8
5 6 8
5 2 1
Hard #5
7 5 8 4 1 9
2 3 6
2
8 6
2 9 3 4
1 8 5
9 1 7 8 3
5 9 7
8 5
Hard #6
2 4 5 6 3
3 1 9
9 2 6 4
3 1 4 7
5 9
5 3 8
6 8 3 2
1
5 7 6
Hard #7
7 1
2 5 3
4 1 9
2 8 3
2 5 7
1 3 4 9
3 2 5
5 8 7 4
3 2 1 8
Hard #8
6 3 9
2 7 8 6
1 9 2
7 8 5
1 8 7
2 4 1 5
4 6 1 7
9 8 3
4 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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