class Doku::Sudoku
This class represents {en.wikipedia.org/wiki/Sudoku Sudoku}. Each instance of this class represents a particular arrangement of numbers (glyphs) written in the boxes.
The template for this puzzle is:
puzzle = Doku::Sudoku.new <<END ...|...|... ...|...|... ...|...|... ---+---+--- ...|...|... ...|...|... ...|...|... ---+---+--- ...|...|... ...|...|... ...|...|... END