Printable Hard Sudoku

Set 1vg0x0u. 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 8
8 2 5
7 3 6 9 8
6 7 1
3 4 8 2
2 4 3 5
2 7 4 6
4 1
3 9
Hard #2
2 5 9 1
7
1 2 3 8
7 1
5 3 7 2 4
2 4 9 3
1 8 7 4
9 2
4 5 3
Hard #3
2 4 1 7
8
1 5
8 7 2
9 5 7 4
4 3 2 7 8
5 4 8 3
8 3 2 5
6 2
Hard #4
3 1 7 2
8 2 5
1 5 9 8
9 4 5 3
5 4 7
6
2 8 3
4 8 7
5 3 2 9
Hard #5
2 1
7 8 1 3
9
2 8 5
3 7 4
1 8 5 7 2
6 3 9
3 4 2
4 9 2 1 3
Hard #6
2 3 4
5 7
6 8 3
7 1 5 9
5 6 8
3 9 2
4 9 5 1 6
7 6 1
1 4 3
Hard #7
3 9 2
6 3 9
9 7
3 1 6 9 5
2 4 7
7 2 3
8 7 1
3 5 8 4 6
1 5
Hard #8
6 3 8
8 6 4
9 2 4
6 9 2
9 1 8 5
7 8 9 4
6 7
2 3 7 8
2 8 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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