Printable Hard Sudoku

Set b4ll2z. 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
2 8 5 9
7 4 3
5 3 6 2 1
2 1 9
4 8 5
5 4 2
6
4 9 3
2 7 5 8
Hard #2
2 6
4
5 3 2 1 8 9
5 1 7 3
8
8 7 1
6 4 1 5 3 2
4 8 9
7 5 1
Hard #3
7 3
1 5 6 4
4 2
6 9 2
9 2 3 8
3 5
6 2 5 7
2 4 8 3
9 1 2 5
Hard #4
5 3
5 7
4 2 1 8
8 2 6 4
6 7 2 9
4 8
8 1 6 7
9
6 4 7 9 3 1
Hard #5
9 6 5
8 9 2 7 1
2 1
7 5 8 3 6
1 7 4
4 7 6
6 4 3
1 5 3
6 2
Hard #6
5 4 9 7
2 8 4
3 6
3 1 2
7 3 4
6 4 5 1 7
7 6 8
1 8 9
2 9 5
Hard #7
2 7
9 5
8 5 1
5 2
8 5 1 7 3 4
2 3
4 5 3 1
9 6 7 2
7 3 5 9
Hard #8
4 5 3 9
9 4 7
5 1 8
3 9 8 5 4
5 9 2
4 6 7
4 5 7
7 4 1
8 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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