A MinLex puzzle is a MinLex subgrid having only one MinLex grid solution.

Here is a MinLex puzzle:

- Code: Select all
`. . . | . . . | . . .`

. . . | . . 9 | . . .

. 8 . | . . . | . . .

-------+-------+-------

. . . | 7 9 . | . . .

7 . . | . . 2 | . . .

. 1 8 | . . . | . . .

-------+-------+-------

. . . | 5 4 . | . . 8

. 4 2 | . 3 . | . . .

. . . | . . . | 5 . .

Can you solve the puzzle?

The puzzle has 15 clues. What is the minimum number of clues of a MinLex puzzle?

JPF