Printable Hard Sudoku

Set 1eiddi2. 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 8
7 3
8 9 1
4 2 5 7
6 7 8 3 9 4
9 4 2
5 2 3
9 1
3 2 6 9
Hard #2
9 8
5 9 2 3
3 1 7
9 4 5 1
9 7
7 8
9 3 2 4 6
1 3 7
8 9 6 5
Hard #3
3 8
2 6 3 4 7
1 6 7 2 3
3 1 8
4 9 5 2
6
8 1 7 3
9 2
3 7 4
Hard #4
5 1 6 4 8
4 2 9
4 2 7
4 5 1 3 8
8 9 6 3
8 6 1
8 3
3 5 4
4
Hard #5
3 9 8 2 7
5 1 4 3
4 8 7
3
9 8 5 2 6
4 5 9
1 7
6 7 1
2 7 8
Hard #6
2 6 5
4 8 3
7 1 2
7 8 4 1
1 9 2 8 4
4 7 6
6 7 2 1
4 6
9 8
Hard #7
6 7 8
6 3 5
9 2 1 5 6
7 1 9 6
6 7 2
8 3
3 1
4 1 9
7 5 2 4
Hard #8
1 3 5
7 9 2
9 8 1
2 7 9 4
4 3 8 6 7 2
9 2 3
4 7 1
3 6 9 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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