Printable Hard Sudoku

Set 12233n2. 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
4
6 4 2 9
3 4 7 2
2 1
4 3
9 8 2 1 5
9 6 7
9 1 7 4 2
8 6 5
Hard #2
9 3 6
1 5 7
2 6 3 7 8
5 3 1 4
2 5
1 2 7
6 8 5 1
9 5
4 7 3
Hard #3
9 8 4 3 7
5 9
3 1
4 6 1 8
1 6 3 2 9
1
2 8
6 5 2 1
8 3 6 5
Hard #4
9 8 2 5
4 2 5 3
8 1
5
7 8 2
1 4 7 9 3
4
7 9 2 6 5
9 1 4 6
Hard #5
1 8 3 7
9 2 7 8
6 9
5 8 4
6 1 3 5
6 7
2 5
4 5 1
1 8 2 7 4
Hard #6
9 3 2
5 8 2 7
4 5
6 3 8
4 2 8
6 5
8 9 1
5 1 6 7 8
7 6 8 9
Hard #7
6 3 8 1
1 3 7 8
2
7 2 4
9 5
6 1 4 9
2 6 1 4 9
4 7 8 6
7 9
Hard #8
4 5 8
1 6 9
8 3 2 5 1
6 1 9 2
9
9 7 6 3
3 1
3 1 5 2
4 7 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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