Printable Hard Sudoku

Set s416mc. 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 5 4 7
9 8 6
8 3
6 3
3 4 5 1
4 2 5 1 7
5 1 4 8
8 4
4 1 9
Hard #2
8 5 1
3 8 7
7 9 6 2 4 5
5 1
8 1 3 4
1 3 8
6 2 7 9 8
3 6 2
Hard #3
1
8 6 5 2 9
9 8 7
3 4 7 1
8 9 3 6
7 9 5 8
6 5 8 1
9 1
1 6
Hard #4
8 9 3 7
5 1 4 2
7 6 4 8 9
7
1 3
5 8 9 7
2 8 6
3 1 7
6 7 1
Hard #5
2 3 7
8 9 1
8 3
4 5 2 6 8
3 6 1 4
2 8 3 5
3 8 6 2
7 4
4 8
Hard #6
3 6 9 1
7 1 9
5 2 6
1 5
7 4
4 5 7 6 1
7 3 8
9 8 2 4
8 6 2
Hard #7
6 9 2 3
5 6 1
2 7 8 9
2 4
4 8 1 9 5
5 1
6 4 9
8 6 5
1 3 8
Hard #8
1 5 9 6 4
3 4 1
5 3 2
9 6 5 2
7 8 3 6
8 4
6 3 9 2
8
2 7 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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