Printable Hard Sudoku

Set 1ucr4a4. 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
8 1 2
3 6 5
4 2 6 7
2 4
9 7 4 3
7 5 4
2 5 3 9 8 1
6 1 8 4
Hard #2
8
6 3 4 5
9 7 1
9 8 6 1 3
3 7 2
3 2 6 9 8
8
5 1 2 9
6 3 4
Hard #3
5 9
3 2 1 7
6 1
4 2 3
1 7 9
3 6 2
3 2 6 9 7
5 8 9 2
9 8 4
Hard #4
3 6
8 2 5 4 3
6 7 1
5 9 1 7
4 2 9 7
3 4 9
1 6 8
5 3 2
6 4
Hard #5
6 9 1 5 7
3 2
7 5 2 6
6 9
1 9
3 2 8 7 4
2 3 5 9 1
2 5
4 7
Hard #6
8 9 6
4 1 7 2
9 7 6
4 1
8 4
2 1 3 7 5
8 2 4 9
7 8
4 5 3 6
Hard #7
3 6 2 1
2 9
8 5 6
8 9 2 1 3
2 3 4
7 1
1 5 8 3 9
7 9 3
8 6
Hard #8
2 1 7 8
3 7 5
1 3
4 5 6
7 8 3 6
5 2
8 9 7
9 2 3 4
4 5 1 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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