anchor.diff:    final int posX;
     final int posY;
   
  -  Widget build() {
  +  Widget build(BuildContext context) {
       Widget text;
       if (flagged)
         text = buildInnerCell(new StyledText(elements : [textStyles[5], '\u2691']));
  
positive.code:   // |uiState| keeps track of the visible player progess.
    List<List<CellState>> uiState;
  
    void initState() {
      resetGame();
    }
  
  
negative.code: 
  enum CellState { covered, exploded, cleared, flagged, shown }
  
  class MineDigger extends StatefulComponent {
    MineDiggerState createState() => new MineDiggerState();
  }
  
  class MineDiggerState extends State<MineDigger> {
    static const int rows = 9;
    static const int cols = 9;
    static const int totalMineCount = 11;
  