Printable Hard Sudoku

Set 1r3cnto. 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
8
7 1 3 8
4 6 2 7
4 2 3 9
9 2
3 6 2 5 7
4 3 1 2
1 9 7
7 8
Hard #2
4 5
8 1 7
9 4 7 5
2 1 9
3 9 7 2
8 4 5 6
2 4 3
7 8 6
9 1 3
Hard #3
6 2 1
8 1
5 8 3
8 3 7 4
8 5
7 1 6
7 4 8
3 5 1
4 2 8 9 1 6
Hard #4
4 2
2 8 6 1 3 9
3 9 6 8
9 1 4 5
4 6 3
1 9 4 7
8 6
2 7
3 4
Hard #5
8 6 3
5 6 1
6 3 4
7 3 6 8
2 1 9
1 5 4 2
9 8 2
3 5
5 1 2 4
Hard #6
8 5 9
8 1 7
2 4
9 1 8 7
6 8
3 1 7 9 4
4 7
5 7 6 9
9 7 3 6
Hard #7
9 3 4 5 2
5
1 7 9 6 5
4 9 8 2
2 1 5 3
6 2 7
9
1 4 3
7 8 2
Hard #8
1 8 5
6 9 1 2
2 4 8 7 9
6 2 8
5 7 1
9 3 2
9 1 7
2 4 1 7
9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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