Printable Hard Sudoku

Set 1ud1aq8. 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
9 6 8
6 4 5 9
2 4 1 9 3
7
3 1 8
9 4 5 6 2
6 1 7 9
4 6 1
3
Hard #2
1 8 3
8 4 5 7 9 1
4 6 2
1 4
7 2 6
5 8 4
9 6 5
5 2 6 4
2 1
Hard #3
8 3 5 2
4 6 3
1 5 8
4 3
7 4
1 9 2
6 8 9 4
1 4 7
8 1 7 4 6
Hard #4
6 9 8 2
4 8 3 1
8
1 6 2 5
5 2 3
7 8 4
4 8 7
4 7 9 2
2 5 6
Hard #5
7 1 8 4
3 5 6 9
6 4 2
5 3 1 2
1 7 4
4 8 9
2 4
3 8 6 5
4 3
Hard #6
8 7 9
7 4
4 2 5
1 5 3 4
9 5
4 6 2 3
7 5 6
6 1 8 9
9 3 7 1
Hard #7
6 1
3 8
4 1 3 6
9 1 8
5 2 4 3
1 8 6
2 3 9 1 8
6 7
4 2 6 5
Hard #8
2 4 8 6
3 6 9
7 1 8
2 7
9 3 7 4
6 4 5 3
5 9
8 4 3
4 2 6 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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