Printable Hard Sudoku

Set 1iggej2. 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 5 3 6
7 8
1 9 8 4 5 2
9 4 2
6 8
5 2 3 7
9 2 1
7 1
3 9 5
Hard #2
7
8 3 5
3 5 7 9
8 3 4 6
6 7 4
3 2 5
9 2
5 7 2 6 1
4 1 8 9
Hard #3
2 5 9 3 8
8 5 2
3
5 1 9 3
9 5 8 6
7 9
6 4 2 3 5
8 7
3 6 1
Hard #4
4 7 6
9 2 6
5 8 2 3
7 2 8 1
2 1 3
9 4
6 8 9
8 5 3 4
9 7 3
Hard #5
5 4 9 6
9 8 3 4 7
6 5 9
4 6
1 4 8 2
5 8 2
2 1 5
4 7
3 1 8
Hard #6
5 3 9
9 5
9 1 7 8
5 6 2
1 4 8 6 2
2 6 7 3 4
8 6 1 3
4
2 4
Hard #7
7 1 2
8 2 9 5
6 4 8 3
2 6
1 7
3 7 5 4 2
8 9
2 6 1 5
2 1 4
Hard #8
1 2
4 9 5
8 7 4 2 9
3 7 1 2
7 9 4 8
5
5 9 6 7
1 7 5
8 1 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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