Printable Hard Sudoku

Set tr0vwk. 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 3 4 7
1
8 7 3 1
9 6 4 5 2
1 6 7
2 6 9 4
2 5 8
3 9 7
6 5
Hard #2
2 3 1
6 4 8 3
1 6
7 2 1 9 4
9 4 6 8
8 1
5
9 3 5 2 1
8 2 5
Hard #3
5 7 9
6 7 1 9 2
8 4 3
4 2 7 9
7 1 3
5 2
9 7 3
9 7 5
1 8 4
Hard #4
1 7 5 8
2 9 5 4
3 7
4 7
8 9 3
3 6 4
5 2 6
7 8 1
4 9 6 5 8
Hard #5
4 6 2
5 2 4
5 7
8 2 6
3 1
7 6 3 4 8
9 4 1 2
3 2 7 4
7 6 1
Hard #6
1
5 4
8 6 2 9
7 8
9 2 5 6 3
3 2 8 9 7
3 5 7 1
8 9 3
4 9 7
Hard #7
3 5 8 1
1 2
9 7 3 6
6 4 9 2
5 4 3
9 8 6 5
4 7 1
3 7 2
2 9
Hard #8
1 6 3 8
5 4
3 8 7
8 4
2 3 5 6
1 8 3
9 7 5 1
2 9 5 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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