Printable Hard Sudoku

Set xpx1ig. 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 2
3 2
3 6 8 7
5 8 4
2 1 6
1 3 2
1 5 3
3 9 1 4 5
7 6 5 4
Hard #2
8 1
4 5 1 2 9
3 6
4 6 5 1
2 7 1 4
5 4
3 1 4
2 7 9 6
9 4 5
Hard #3
1 8
9 3 7 5 2
6 5 4
6 8 2 7 4
8 6
3 7 9
5 8 3
4 2 8
7 4 2
Hard #4
2 4 6 8
9 7 5 1
5
1 5 8 4 7
7 4 2
3 1 4 8
6 5 4
9 7 2
9 5
Hard #5
5 2 3
4 2 9 3
8 1
4 1 2
7 5 1 9
5 7
8 5 4 7 2
2 8 7 4
9 3
Hard #6
7 2
7 8 3 1 4
2 4 3
2 3
3 7 6 1
8 1 6
9 1
1 2 3 9 5 7
8 5
Hard #7
3 1
6 4 5
9
2 5 8 7 4 9
8 7 6 9 2
9 2 1
9 4 2
9 3 6
8 1 3
Hard #8
3 2 1 4 7
7 1
4 5 2 7 8 6
6 4 2 8
7 8 9
5 2
7 8 3 5
1 5
9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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