Printable Hard Sudoku

Set t4k3ro. 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 6 4
3 1 4 6 7
2 7
7 5 3 9
6 8 5
4
2 6 4 9
8 6 5 3
4 1 7
Hard #2
2
5
4 1 6 8
3 6 7
8 5 2 3
4 3 6
1 4 7 5 2
5 6 2 1
2 6 3 4
Hard #3
6 3 2
5 2 7
2 4 1 8 6
7 2 8 3
9 4 6 5
8 6
9 5
7 9
1 6 8 3
Hard #4
7 1 8 6 2
8 4
1 5
6 1
2 3 7 1
3 1 9
5 7 2 4 9
4 9 5 8
8 3
Hard #5
9 5 3 8
3 4 9
6 7 3
2 6 9 7 8
7 5 4
5 3 6
6 8 4
4 7
8 2 1
Hard #6
4 5 2 3 7 6
8 5 4
9 4
4 7 3
3 2 1 6
8 1 5
8 9
6 1 7 3
7 5
Hard #7
4 5
5 8 1
6 5 2 3
3 5 8
6 2 8 1
1 6 7 9 2
3 7
9 1 5
2 6 9
Hard #8
8 3 9
3 2 6 1 4
6 1
4 7 2
8 6
4 2 7 5 3
9 5 3
1 2 9
8 1 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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