Printable Hard Sudoku

Set r3l2gf. 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 6 3
1 3
3 2 1 8
2 4 7 6
7 4
9 5 7 4
9 2 8 6
7 8 3
1 2 9
Hard #2
6 5
9 6 5 8
5 8 3 9 1
6 7
7 5 6 2 3
2 9
5 9 1
7 3 4
8 3 2
Hard #3
7 6
2 4 3 5
5 3 8 1
9 2 3
7 5 4
8 5 2
4 3
8 3 1
7 6 9 1 5
Hard #4
4 2 8 9
3 7
9 2 1 5
4 2
5 7 2 4 3
2 9 8 5
7 1 4 2
6
1 7 9
Hard #5
3 4 7 2
5 2 9 4 6
1 5 4
5 3 6 7 1
9 2 4 5
7 8
5 8
1 6 3
9
Hard #6
6 2 7
7 2 6 3
3 9
1 2 4
8 4 3 9
5 3 2 1
6 9 1
7 6
1 5 2 4
Hard #7
1 8 2
5 2 6
7 1 8
3 5 8 2
1 3 9 2
5 7 4
3 2 9 4 6
7
8 2 1
Hard #8
6 9
7 2 1
5 9 8 2 7
6 3
4 3 5 8
6 8 3 9
8 9 2
1 9 5 3
3 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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