anchor.diff:    }
   }
   
  +/// {@template bottom_wall}
  +///
  +/// An specifc [Wall] used to create bottom boundary of the
  +/// game board
  +///
  +/// {@endtemplate}
   class BottomWall extends Wall {
     BottomWall(Forge2DGame game)
         : super(
  
positive.code: import 'package:flame_forge2d/flame_forge2d.dart';
  import 'package:pinball/game/components/components.dart';
  
  class Wall extends BodyComponent {
    Wall({
      required this.start,
  
negative.code:         );
  }
  
  /// {@template bottom_wall_ball_contact_callback}
  ///
  /// The [ContactCallback] responsible for indentifying when a [Ball]
  /// has fall into the bottom of the board
  ///
  /// {@endtemplate}
  class BottomWallBallContactCallback extends ContactCallback<Ball, BottomWall> {
    @override
    void begin(Ball ball, BottomWall wall, Contact contact) {
  