Printable Hard Sudoku

Set eqn63u. 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
5 4 1
2 1 9 4 8
9 1 7
5 2
4 3 2 7 6
9 4 7
9 7
6 4 3 9
6 9
Hard #2
7 8 5
9 4 3
4 2 6 7
8 2
9 6 8 7 5 1
5 1 7
9 8
2 6 4
4 1 9
Hard #3
4
4 1 7
2 8 9 6 3
5 3 9 4 1
6 9
7 5 8 6
1 5 4 3
8 1 6 2
8
Hard #4
7 6 9 4
2 9 1
5 8 7 6
8 3
2 4 1
7 2 6
3 8 7
4 1 5 8
2 3 9
Hard #5
1 9
6 7
8 2 1 4 9
8 6 5 4
3 4
9 2 8 6
6 8 3 2 1
5 4 3
7 6
Hard #6
3 6 9 7 5
7
7 2 8
1 4 3 8
5 9 3 6 8
2 4 1
6 7
9 4
8 1 7 3
Hard #7
8 7
3 8 9 6 2
1 6 2 9
9 5 8
8 5 3 1 4
1 7
5 6 7
4 9 6
4 9
Hard #8
6 7 3 1
8 2 9
9 3 4 1 5 8
5 6
9 2 5
7 9 8 4
5 2 6
5 9 1 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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