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Sudoku Puzzles Level 18

LEVEL 18

x 7 x 3 x 9 x x x	x x x x 6 x 3 1 x	x x 2 x x x x x x
7 x x x x 3 x 1 x	x x x x x 5 x x x	x 3 x 8 x x 4 2 5
x x x 5 x x 6 x x	x x x x 9 6 8 x 7	x x 7 x x 3 9 x x

3 x 3

x 2 x 3 x x x x 6	x x x x x x x 7 x	x x x x x 2 x x x
x x x x x 1 6 x x	x x 9 x 5 x x x x	x 6 x 2 x 7 x 5 1
x x x 2 x x x 1 x	1 4 x 7 x x 8 x 2	x x 8 1 x 5 x 3 x

3 x 3

x 7 x x x x x x 8	x 4 x 2 x x x x 6	x 3 6 x x 1 x x x
x x x x x 9 4 8 x	x x x 4 x 3 x 9 x	x x 9 x x 5 7 x x
x 5 x 9 1 x x 3 x	8 x x x 6 4 x x x	x x x x x x x 2 x

3 x 3

6 x x x x x x 8 5	x x x 2 8 x x 7 x	x x x x x x x x x
x 9 x x x x x x x	x 1 x x x x 6 x x	x x 3 2 5 6 x 4 x
7 x x 5 2 x x x x	1 x x x 9 x x x 4	x x x 8 x x x 7 2

3 x 3

6 x x x x x x 8 5	x x x 2 8 x x 7 x	x x x x x x x x x
x 9 x x x x x x x	x 1 x x x x 6 x x	x x 3 2 5 6 x 4 x
7 x x 5 2 x x x x	1 x x x 9 x x x 4	x x x 8 x x x x 2

3 x 3

7 9 x x 5 8 1 x x	x x x x x x 8 6 x	x x 8 x x 1 7 x x
x x x x x x x x 4	2 x x 5 x x x 8 9	x 1 x 9 x x x x 3
x x x x x x x 3 x	6 x x 3 x x 7 5 8	3 x x x 7 5 x x x

3 x 3

x x x x x x 1 x 3	8 x x 6 9 x 5 x 4	x x x x x x 2 x x
6 x x x 2 1 3 x 9	x 3 x x x x x x x	x x x 6 x x 4 5 x
x x x x x x 4 7 x	x x 2 x 5 x x x x	x x 9 3 x x x 6 x

3 x 3

x x x x x x 1 x 3	8 x x 6 9 x x x 4	x x x x x x 2 x x
6 x x x 2 1 3 x 9	x 3 x x x x x x x	x x x 6 x x 4 5 x
x x x x x x 4 7 x	x x 2 x 5 x x x x	x x 9 3 x x x 6 x

3 x 3

x 8 x 4 1 6 5 x x	x x 4 2 x x x x x	x x 2 x 8 9 x x 7
x x x x 7 x x x x	x x 7 5 x 2 9 x x	x x 5 x 1 x 8 7 x
x x 7 x x 1 x 4 x	6 x x x 5 x x x x	x 3 8 7 x x 5 x x

3 x 3

x 8 x 4 1 6 5 x x	x x 4 2 x x x x x	x x 2 x 8 9 x x x
x x x x 7 x x x x	x x 7 5 x 2 9 x x	x x 5 x 1 x 8 7 x
x x 7 x x 1 x 4 x	6 x x x 5 x x x x	x 3 8 7 x x 5 x x

3 x 3

x 8 x 4 1 6 5 x x	x x 4 2 x x x x x	x x 2 x 8 9 x x x
x x x x 7 x x x x	x x 7 x x 2 9 x x	x x 5 x 1 x 8 7 x
x x 7 x x 1 x 4 x	6 x x x 5 x x x x	x 3 8 7 x x 5 x x

3 x 3

x 8 x 4 x 6 5 x x	x x 4 2 x x x x x	x x 2 x 8 9 x x x
x x x x 7 x x x x	x x 7 x x 2 9 x x	x x 5 x 1 x 8 7 x
x x 7 x x 1 x 4 x	6 x x x 5 x x x x	x 3 8 7 x x 5 x x

3 x 3

2 1 x x x x x x x	x x x x x 2 1 x 4	4 6 8 x x x x x x
x 5 x x x x x 9 x	x 9 x 4 x 8 x x 7	7 3 x x x x x 1 x
x x 9 8 x x 7 3 x	x x 6 x x x x 4 9	3 x x x x 9 6 5 x

3 x 3

2 1 x x x x x x x	x x x x x 2 1 x x	4 6 8 x x x x x x
x 5 x x x x x 9 x	x 9 x 4 x 8 x x 7	7 3 x x x x x 1 x
x x 9 8 x x 7 3 x	x x 6 x x x x 4 9	3 x x x x 9 6 5 x

3 x 3

2 1 x x x x x x x	x x x x x 2 1 x x	4 6 8 x x x x x x
x 5 x x x x x 9 x	x 9 x 4 x 8 x x 7	7 3 x x x x x 1 x
x x 9 8 x x 7 3 x	x x 6 x x x x 4 x	3 x x x x 9 6 5 x

3 x 3

x x x 8 4 x x x x	8 x x x 7 1 4 9 3	x x x 3 2 x x x x
9 x 6 x 8 x x x 7	x x x 5 x x x x x	x x 1 6 x x 2 x x
x 5 x x x 8 x x x	3 x x x x 6 x x x	7 x 9 1 x 2 x x x

3 x 3

x x x x 4 x x x x	8 x x x 7 1 4 9 3	x x x 3 2 x x x x
9 x 6 x 8 x x x 7	x x x 5 x x x x x	x x 1 6 x x 2 x x
x 5 x x x 8 x x x	3 x x x x 6 x x x	7 x 9 1 x 2 x x x

3 x 3

8 x x x x x x x 9	x x x 8 x x x x 6	7 x 6 5 1 x x 4 8
9 8 x 5 x x 6 x x	x x x 3 x 7 x 9 x	x x 3 x x x x x x
x 4 x x x x 3 x x	x x x 7 5 x x x x	x x 7 8 x 2 4 6 x

3 x 3

8 x x x x x x x 9	x x x 8 x x x x 6	7 x 6 5 1 x x 4 x
9 8 x 5 x x 6 x x	x x x 3 x 7 x 9 x	x x 3 x x x x x x
x 4 x x x x 3 x x	x x x 7 5 x x x x	x x 7 8 x 2 4 6 x

3 x 3

x 6 x 7 x x 1 8 x	x 1 x x x x 3 x x	x 7 x x x x x x x
8 x x x x 4 x x x	x x x x x 1 8 x x	x x 4 9 x 5 2 x 3
x x x 9 x x x x x	x 2 x 6 x 4 5 x 9	8 4 x x x x x x x

3 x 3

x x x x x x x 2 x	x x 9 x 3 x x x x	4 x x x 6 1 5 x x
x x 1 x x 5 x x x	6 7 x x x 4 x 1 x	x x x 1 3 x x 7 x
x 4 2 x x x x x 7	9 x x x x x x x 6	x x x 6 x 8 x 4 2

3 x 3

x x x x x x x 2 x	x x 9 x 3 x x x x	4 x x x 6 1 5 x x
x x 1 x x 5 x x x	6 7 x x x 4 x 1 x	x x x x 3 x x 7 x
x 4 2 x x x x x 7	9 x x x x x x x 6	x x x 6 x 8 x 4 2

3 x 3

4 x 6 x x 8 x 1 x	8 x x 1 x x x x x	x x x x x 5 x x x
x 9 x x 4 x 8 x x	x x 3 x 2 x 5 x 7	x x x 3 x 7 9 x x
x x 1 7 x x x x x	3 6 x x x 8 x x x	x 9 x x 2 x 5 x x

3 x 3

x 2 5 x x 4 x 1 3	4 9 x x x 7 2 x x	x x x x x 5 x 4 6
2 x x x 8 1 5 x x	8 x x x x x x x 3	4 x x x 3 x x 8 x
x 5 x x x x x x 8	x x x x x x 5 4 x	6 x 3 x x x x x x

3 x 3

x 2 x x x 4 x 1 3	4 9 x x x 7 2 x x	x x x x x 5 x 4 6
2 x x x 8 1 5 x x	8 x x x x x x x 3	4 x x x 3 x x 8 x
x 5 x x x x x x 8	x x x x x x 5 4 x	6 x 3 x x x x x x

3 x 3

x 1 9 x 4 x x x 3	2 x x 6 9 x 8 x x	x x x 1 x x x x 4
x x x x x x x 3 x	5 1 x x x x x x x	x 6 9 x x x x 2 x
x x x 5 x x x x x	x x x x x x 9 8 x	3 x x x x 8 x 7 x

3 x 3

x x 9 x 5 x x x x	x x x x 6 x x x 8	2 6 x x x x 7 x 9
7 4 x x x 5 x 1 x	x 5 x x 4 x 3 x x	x 1 x x x x x x x
x x x x x x 1 7 x	x 3 x 8 7 x x x x	x x x 5 x 2 8 x x

3 x 3

x x 5 x x x x 8 x	x x x 6 x 7 x x x	x 8 2 x x x x x x
x 6 x 4 x x x 2 x	4 x x 8 3 x x x 9	x x x x x 7 8 x x
6 x x 7 x x x x x	x 4 x x 5 x x x x	2 1 x x 9 x x x 4

3 x 3

x 5 9 x 8 x x x x	x x x 4 1 x x x x	8 x x 6 x x x x x
x x 7 x 1 x x x x	x x 9 5 x 4 x x 3	x 6 x x x x x x 5
x 9 x x x 6 x x x	x x x x x x x 3 x	x 3 1 x x 2 x 7 x

3 x 3

6 x 5 x x 1 3 7 x	8 x x x x x 5 x x	7 9 2 x x x x x x
x 5 x x 1 x x x 4	x x x 7 4 x x x 8	x x x x x 8 1 x 7
x x x x x x 5 x x	x x x x x x 9 2 x	x 7 x 9 1 5 x x x

3 x 3

6 x x x x 1 3 7 x	8 x x x x x 5 x x	7 9 2 x x x x x x
x 5 x x 1 x x x 4	x x x 7 4 x x x 8	x x x x x 8 1 x 7
x x x x x x 5 x x	x x x x x x 9 2 x	x 7 x 9 1 5 x x x

3 x 3

x x x x x x 2 x 4	9 x x x 2 1 x 3 x	3 x x x 8 x x x 1
x x 5 4 9 x x x x	x x 9 3 x 2 x 6 x	x x x 7 x x x x x
x x x 8 x 7 5 x x	7 x 4 x x x x x x	x 9 2 4 x x x x 7

3 x 3

x 8 x 3 9 x x x 4	9 x 1 7 x x x x x	x x x x x x x 8 x
x x x x x 9 8 x x	x 1 x x x x x x 6	x 2 x 3 x x x x x
x 4 3 x x x x 5 x	2 x x x 5 x x x 8	x x 5 2 7 x x 4 6

3 x 3

x x x x x x x x x	x x 5 x x x 3 1 x	1 7 2 x 8 x x x x
x 2 8 3 x x x x x	x x x x x x 1 3 8	x 6 x 4 x x 2 x x
x 6 x x 8 5 4 9 x	9 8 1 x x x 6 x x	5 x 4 x x x x x x

3 x 3

6 x x x x x x x x	x x x 4 6 x x 1 x	x 2 4 x 9 x x x 6
3 x x x x 4 7 x 1	x 4 8 x x x x 3 9	7 x x x x x x x x
x x 2 x 5 x x x x	x 7 3 x 9 x x x 4	x x 9 3 8 x x x x

3 x 3

x 1 x x 5 4 7 x 2	x x x x 8 x x x x	7 x 3 x x x x 9 x
x x x x 9 x x x x	1 x 3 x x x 4 x x	x x x 4 8 x x x x
1 x x x x x 2 4 5	x 5 x 9 x x x x x	x x x 5 4 x 3 x x

3 x 3

x 1 x x 5 4 7 x 2	x x x x 8 x x x x	7 x 3 x x x x 9 x
x x x x 9 x x x x	1 x 3 x x x 4 x x	x x x 4 8 x x x x
1 x x x x x 2 4 x	x 5 x 9 x x x x x	x x x 5 4 x 3 x x

Make your own

2 x 2

x x x x	x x x x
x x x x	x x x x

2 x 3

x x x x x x	x x x x x x	x x x x x x
x x x x x x	x x x x x x	x x x x x x

3 x 3

x x x x x x x x x	x x x x x x x x x	x x x x x x x x x
x x x x x x x x x	x x x x x x x x x	x x x x x x x x x
x x x x x x x x x	x x x x x x x x x	x x x x x x x x x

Note that the difficulty level above 10 here means that's how hard it was to decide there was a single solution. When deciding which of 2 values can occupy one cell, you may find that choosing the first value yields a solution, but trying the second value may force you to try all values in yet another cell before deciding the second value doesn't yield a solution at all.
In other words, knowing there's just one unique solution may make the puzzle easier to solve than what the computer goes through to make sure it's unique.

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