Printable Hard Sudoku

Set 18rlxx3. 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
7 4 9
3 9 2 4
2 6 7 5
9 3 7
7 3 8
6 8 2 1
1 3 6
4 1 2 6 7
Hard #2
6 4
4 8 7 3
1 2 4
3 7 9 6 1
6 5 7 4
8 6
9 6 5
5 3 8
3 9 2
Hard #3
4 1 3 2 8
2 6 7
7 1 4
4 5 1
4
7 8 6 1 3
1 9 6 3 5
8 2 4 3
Hard #4
5 4
4 8 6 5
5 9 7
6 4 8 3
1 2 6
2 5
9 5
6 3 7 2 9
5 2 7 6
Hard #5
2 9 6 8
7
9 3 1 5
3
7 9 8 1 2 5
5 2 9 8
9 7 4
3 8 1 4 7
1
Hard #6
1 9 6 2 8
9 3 7 1
8 1 7
1 5 3 4
2 7 9
5 9
4 6
2 6 8
5 3 2
Hard #7
9 6 8
7 4 1 3
4 6
9 5 8 7 3
5 1 9 6 2
8 9
9 2
6 4 1
1 2 5
Hard #8
7 5 4 1 3
8
2 3 7 5
3 4 7 2
6 8
9 3 5 4
2 7 9 3
1 8 2
2 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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