Printable Hard Sudoku

Set 1pitf0w. 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
9 5 6
1 3 2 9
8 1 4
6 2
7 5 3 4 2
4 3
3 6 2
8 9
1 7 2 4 3
Hard #2
8 3
2
2 5 4 6
4 6 7
5 9 2 8 4 1
8 6 5
2 9 3
9 6 5
7 1 2 6
Hard #3
2 5
4 8 6 7
6 5 4
9 1 4 2
8 5 2 9
9 7 5
5 3 1 9
7 2
5 3 2
Hard #4
2 9 5 1 8
4 8 2
7 5 3 1 4
1 6 3
4 9 1
4
9 1 5
6 4 3 7
7 1
Hard #5
4 6 8
2 4 5
8 7 5 9
3 4 6 9
5 2 8 1
8 9 2
3
9 8 7
8 3 2 4
Hard #6
6 9 4
3 1 4 8
4 6 3
8 5 3 7 6 4
9
4 3 8 5
6 3 7
1 5
1 3 2
Hard #7
5 2 8
9 1 4 3 7 6
2 5 6 9
1 2
7 9 3
2 7 4 1 8
4 9 5
1 6 4
Hard #8
8
4 1 7
2 4 9 8
7 8 2
1 9 5 2
5 3
8 3 1 5 2
2 7 5 6
1 4 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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