Printable Hard Sudoku

Set ctg471. 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
5 9 4 3
3 2 7
6 4
9 5 1
8 4 5
5 7 2
7 9 6 2
4 8 1 5 3
6 9
Hard #2
2 1 3
4 2 1 9
5 6 8 7
5 3 8
4 8 7
7 3 9
2 4
6 4 1
4 7 8 5
Hard #3
2 9 7 8
6
1 8 5 7
8 6 2 1
3 7 1 5
5 7 9
8
2 9
4 5 8 3 7 1
Hard #4
4 2 7 9
8 7 6 3
2 4 8
3 2 7 9 1 4
7 8 5
1 6
5 4 9 1
6 9
6
Hard #5
3 4 8 1 5
6 2
2 1 9
5 6 8 3
1
4 6 5
1 9 6 4
9 4 2 6
4 7 9
Hard #6
4 8 5
3 2 7 4
1 6 2
1 3 5 7 8
9 5 8
8 6 5
1 8 3 6
5 4
5 9
Hard #7
7 6 2
5 2 3 1 4 9
1 8 6
2
3 9 8
4 5
7 1 5 4 3
2 5 6
3 9 7
Hard #8
5
9 6
3 9 2 4
4 5 6
5 1 8 2 3
9 7 1 2 5
8 9
3 1 8
7 9 3 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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