Printable Hard Sudoku

Set trlu4x. 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 3 2 5
5 9 2
3 5 8
7 3 1
8 1 6 5
7 4
1 3 9
2 6 9 7
7 1 4
Hard #2
3 2 6
1 8 9
3 7 5
6 1 9
4 2 5
7 8 4 6
5 7 6
9 4 8 7
2 9 3
Hard #3
1 7 6
5 8 9
5 3
1 7
8 7 2 1 4
2 1 6 3
4 3 9
5 6 1 2
3 6 5
Hard #4
7 2 8 4
4 6
5 3 4 8 2
1 9 2
1 6 8 5 4
7 5 2 3
6 8 7 9
1 5
Hard #5
2 6 4
4 7 2 8
7 5
9 5 1
8 4 9 7
2 6 9
4
1 8 4 6
8 5 7 3 1
Hard #6
4 8 5 7 2
3 8
6 2 4 7 3
3 6
2 4 9 6
7 5 4
2 7 1 5
6 5
8 6
Hard #7
4 6 9
8 7 4 6 5
3
9 1 5
8 9 4 7 1
3 4 8
6 5 2 4 7
1 8
6 1
Hard #8
7 2 8
2 6 1 9
9 7 2
9 4 5
8 7 1 4 3
9 6 2
9 7 2
2 4 8
4 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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