Printable Hard Sudoku

Set 1lfjez3. 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
5 9 6 4
3 8 5
4
1 7 5 8
3 1 5
6 7 8 4
4 7 6
7 6
8 6 2 7 9
Hard #2
5 7 3
6 9 1
2 9 6
9 4 5 7
4 5 3 8
9 6 4
7 3 5 2
2 1
8 2 9
Hard #3
2 4 9
6 4 2
3 9 7
2 4 9
3 5 9 6 2 7
7
8 5 7 3
7 3 1 6
1 8
Hard #4
5 1 4
6 9
1 7 2 9
5 4 8
2 4 6
2 6
1 5 4 7 8
5 8 3 4
7 8 1
Hard #5
2 4 9 5 6 3
1 6 8
3 1 8 2
8 6 9
4 6
2 4
1 6 4 8 3 2
9 3 5
Hard #6
7 6
9 2 4
2 1
2 3 5 8 6 4
3 5 7
7 9
3 1 6 5
6 9 2
5 9 4 1
Hard #7
8 3 6 7 5
5 9
7 3 1 6
3 9 5 4
1 6
9 8 7 2
4 9 2
1
5 9 4 7
Hard #8
1 3 2
5 1
9 6
9 4
8 2 5 4 3
5 2 6 3 8
9 3 8
7 8 4 6
6 7 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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