Printable Hard Sudoku

Set 4acc3e. 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
1 3 6 7
2
9 5 1 2
5 6 3 1
8 5 4
5 2 1 4
8 6 7 3 2
3 6
7 4
Hard #2
1 5 8 6
7 6 2 1
6 1 4
2 9 6
7 3 4
4 8 5 3
3 9 8 7 1
6
2 5
Hard #3
8 9 3
6 8 5
2 6 4 9
3 1 8 5 7
8 1
9 4 6
1 7 5 6 4
5 4
8 9
Hard #4
8 4 3 2 1
9 1 8
6 2 1
9 1 2 7 4 3
5 3 2 6
8 3 7
2
4 6 9 5
Hard #5
2 1 4 5
3 6 2 8
7 8 4 2 6
1 9
3 5 4 1
1 3 7 6 4
2
9 6 4 3
Hard #6
9
1 2 5 7
8 6 3
5
4 6 9 2 5
5 1 9 3 8
2 4 8 5
3 1 6
5 7 3
Hard #7
3 7 1
4 6 9
1 9 7 4
3 2
9 8
5 1 4 6
9 8 6 1
2 3 1 5
1 8 4
Hard #8
5 6 4
2 4 7
4 3 9 1
3 6
6 8 7 3
1 8 9
9 3 4 8
7 8
2 7 9 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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