Printable Hard Sudoku

Set 2ce1rj. 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
8 1 3
8 6 3 4
3 5 8 1
8 6 1 7 9 5
9 4
6 4 7
3 7 8 6
9 2
Hard #2
1 7
3 5 8 4
7 3 9
9 1 3 6 4 7
3
3 2 5
2 6
7 5 9 8
6 8 1 2
Hard #3
9 4 3 8
4 6
2 1 8 4 9
4 2 6
3 8
6 9 7
7 1
3 2 7 5 4
6 8 2
Hard #4
6 1 4 3
3 2
3 2 5 9 6
8 1 9
7 8 3
3
9 6 1 2
2 5 4 7
1 2 8
Hard #5
1 2 8
3 6 4 5
8 6 7
4 9
7
5 1 3 9 7
2 6 9 1 3
8 4
4 7 5 2
Hard #6
1 5
9 1
3 7 8 1
5 6 9 1 4 7
1 6 4 3 2
4 3 7
7 3 2 4
8 9 6
Hard #7
3 6 5
2 4 9 1
7 2
5 3 6
2 3
7 5 2 8
5 7 6
9 6 5
2 5 1 7 3
Hard #8
4 3 9
8 2 1 3
7 6 4 9
7
9 8 1
1 8 4 2
3 2 9 4
8 2 5 6
7 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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