Printable Hard Sudoku

Set t9ujw. 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
1 9
5 2 6
5 6 9
3 2 8
9 7
2 8 4 9 7
1 4 7
7 8 6 5 1
6 7 3
Hard #2
7 1 6 8
7 8
6 2 3
9 4 1 8
8 7 5 3 9
5 3 4
7 5 4
5 3
6 1 2
Hard #3
5 9
3 4 1 8 9
7 6
2 5 3 4
4 8 2 3 5
1 6 7
9 6 3 7 2
8 4
6
Hard #4
1 3 9 6 4
7 8 4 2
4 5
1 7 4
8 2 5 1 3
4 2
2 7 6
6 7 8
5 1
Hard #5
1 4
6 3 9
8 2
4 3 7 6 8
9 2
4 8 5 1
1 6 5
2 9 1 8
7 5 9 1
Hard #6
4 9 7
4 9 2
5 7 1
6 2 8 4
1 8 5
3 4 6 1
3 7 9 5 8
4 3
1 6
Hard #7
1 7 4 8
8 4 3 1
5 2 6
9 3 7
6 2 5 8
7 5 9
4 3 7
2
2 7 9 1
Hard #8
1
4 8 7
2 6 3
5 2 7 3
3 4
6 5 8 3
2 5
8 9 5 2 7
1 2 6 8 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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