Printable Hard Sudoku

Set 1ae9iu3. 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 6 4 1
3 9 1 8 2
6 7
1 4 5
8 9 2
1 4 2 6
4 2 6 3
5 1 4
Hard #2
7 1 5 9
5 9 3
9 3 2 8 6 1
9 2
2 6 9 5
4
1 5 8
3 7 4
7 2 3
Hard #3
8 9 4
4 5 1 2
1 9 5
9 8 1 5
7 1
2 5
7 4 5 9
5 8 7 3
2 6 7
Hard #4
1 2
2 7 4
7 4 5 6
7 3 9 4 1
4 7 6
1 5 3
8 4 6
4 9 2 8
9 7
Hard #5
4 5
1 6
5 9 2
1 2 9 7
8 3 5
7 5 4
9 3 7
7 9 8 6 2
3 4 6 9
Hard #6
9 2
7 2 4
2 9 6 7 1
5 7 3 8
6 3
8 2 6
8 2
5 3 2 8 1 9
1 5
Hard #7
1 9 7 8
5 8 1
3 2 5 4
5 4 8 1
6 8 7 9
9 5
7 6 2 4
1 6
7 9
Hard #8
2 4 3
5 6
7 6 9
4 7 9
5 2 8
9 3 8 2 7
9 8 7
4 6 3 8
6 4 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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