. 7 .  . . .  . . .
. . .  . . .  . . .
. . .  . . .  . . .

. . .  . . .  . . .
. . .  . . .  . . .
. . .  . . .  . . .

. . .  . . .  . . .
. . .  . . .  . . .
. . .  . . .  . 3 .
==
Solution
==
Create
Regexp::Sudoku:: -> new -> init
                 -> set_german_whisper (qw [R1C1 R1C2 R1C3 R2C3 R3C3
                                            R3C2 R3C1 R4C1 R5C1 R6C1
                                            R6C2 R6C3 R5C3 R4C3 R4C4
                                            R4C5 R4C6 R5C6 R6C6 R6C5
                                            R6C4 R7C4 R8C4 R9C4 R9C5
                                            R9C6 R8C4 R7C4])
                 -> set_german_whisper (qw [R1C8 R2C8 R2C7 R3C7 R4C7
                                            R5C7 R6C7 R7C7 R7C8 R7C9
                                            R8C9 R9C9 R9C8])
==
Name: German Whispers Sudoku
URL: https://www.youtube.com/watch?v=c35lhg7wyRc
     https://app.crackingthecryptic.com/sudoku/DgR37JjRqG