Printable Hard Sudoku

Set 5xl0p4. 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 1 9
4 1 8
3
7 5 3 2
1 2 8 5
9 1 3
5 3
3 1 4 2 7 8
9 7 2
Hard #2
8 4 1
5 7 3 2 8
1 2 3 6 7
6 9 7 5
4 3 7
2 4 6
3 9
5 2 1 4
Hard #3
3 4 5 1
8 3 1 2
4 6 9
5 2
8 6 7 5
9 1 4
6 9
8 7 6
4 5 8 3
Hard #4
6 1 5 3
5 6 1
8 1 3
3 7 9 2
2 5 9 8
8 1 6
2 7 9 3
1 6 9 7
Hard #5
1 5 7 2
7 3 8 6
9
3 1
9 3 8 2
2 1 5
2 5 7 6 3
7 6 4
3 9 8
Hard #6
7 8 9
5 6 2
7 4
5 7 9
1 6 3 5 4
4 8
3 2 7 5
1 9 7
7 1 3 2
Hard #7
7
3 2 7 4
2 1
1 9 8
4 5 6 3
8 5 1 2
8 1 6
5 3 1 2
7 4 8 1
Hard #8
5 2 4
8 4 6 7 5
2 7
7 3
5 7 1 9
9 3 1 6 7
1 6 4
7 8 5
4 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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