Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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