Printable Hard Sudoku

Set 18zzqg6. 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 6 3
7 1 8 4
1 8 9
4 6 2
1 3 7
6 9 5 8
1 4 2
7 3 8 9
9 6
Hard #2
8 9 6 2
4 3 9
3 9 1
2 6 8 4
3 4 5
3 7 2 1
7 9 3
1
5 2 7 8
Hard #3
1 6 9
7
8 2 4 5 3
5
6 2 9 5
3 2 4 8
4 3 2 7
1 7 6 4
9 4 3
Hard #4
8 7 4 2
2 1 6 8
9
3 9 1
8 7 2 9
1 8
9 7 1 5
7 5 3 4
3 2 9
Hard #5
2 6 3
1 5 7 2
3 8 9 1
1 3
7 3 6 2
2 3
1 6 3
3 4 8 5
8 2 7
Hard #6
9 2 8
3 5 6 2
4 6 7 9
7 5 8
9 4 5 8
2 3
8 6 7
3 9
2 1 3 4
Hard #7
5 3
6
9 2 6 5 3 1
1 3 2 8 4
6 7
5 9
4 1 8 2 3
8 4 1
3 2 5
Hard #8
1 2 7
2 7 3 5
5 3 4
7 1 8
6 5 7 9
4 3 9
2 4 9
3 7 4
9 7 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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