Printable Hard Sudoku

Set boi4tv. 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 1 5
2 6 8 9
7 5 1
7 8 4 3
3 9 5 6
5 3 9
5 4 8 9 2
3 6
7
Hard #2
6 7 2 1
1 7 4 5
8 1
1 6
2 4 5
3 2 9 1
2 6 9 5
6 1 8
2 3 7
Hard #3
9
6 4 8 9
4 9 1 2 7 5
1 3 2 8 5
3 6
9
5 2 8
5 9 3 6
2 7 4
Hard #4
2 7 6
3 1 9 2
1 8 5
1 9 4 5 6 3
7 9
6 3 1 7
2 7 3 6
6 9
8
Hard #5
8 2 3
8 7 6
1 4 5 8
6
4 5 9 8 3
7 1 5
1 5 4
6 5 7 2
2 4 3
Hard #6
6 9 4
7 1
4 7 8 6
4 7 6
1 3 8
3 9 4 2
6 2 5 7
8 1 5
3 8 4
Hard #7
1
7 6 4
3 8 7 5
1 4 7 9
6 9 5 2
1 8 7 3
8 4 7
1 7 2
5 2 6
Hard #8
2 1 7
2 9
5 2 8
3 2 4 1 6
9 2 4
9 7 5
5 3
3 6 9
4 8 1 2 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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