Printable Hard Sudoku

Set 1iuua2p. 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
3 8
7 9
7 5 1 9
8 5
2 3 4 8 9
9 6 8 5
9 6 5 4
4 8 6 7
3 5
Hard #2
7 1
8 2 3 5
6 4 3
5
7 1 8
4 5 6 2
2 5 1 8
8 3
1 5 8 3 7 9
Hard #3
1 6 5 8
7 3
4 1 6
1 6 4 5
8 6 3 9 1
5 3 4
5 7 9
3 9 8
7 2
Hard #4
3 6 7
3 5 4
7 1 4 6 5
6 9
8 9
5 1 3
2 8 9 1
9 5 2 3 6
9 7
Hard #5
1 7 6 9
6 2 3 5
7 1
4 5 3
2 6 8 1
2
8 6 5 4 2
4 5 9
9 7 4
Hard #6
4 2 1 7
4
9 1
4 2 3 9 8
6 5 2 4
9 8 3 5
3 2
2 1 4 3
4 5 6
Hard #7
2 7
6 7
6 1 5
3 1 8 9 6
4 5 7 9 8
9 8 1 3
3
7 8 2
8 6 7 1
Hard #8
5 9 8 7 3 4
4 1 5
2 1 9
8 5
5 1 7 3
4 7
3 5
8 2 6
1 4 2 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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