anchor.diff:  }
   
   /// {@template bottom_wall}
  +/// [Wall] located at the bottom of the [board].
   ///
  -/// An specifc [Wall] used to create bottom boundary of the
  -/// game board
  -///
  +/// Collisions with [BottomWall] are listened by
  +/// [BottomWallBallContactCallback].
   /// {@endtemplate}
   class BottomWall extends Wall {
     BottomWall(Forge2DGame game)
  
positive.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
  
negative.code: import 'package:pinball/game/components/components.dart';
  
  /// {@template wall}
  /// A continuos generic and [BodyType.static] barrier that divides a game area.
  /// {@endtemplate}
  class Wall extends BodyComponent {
    Wall({
  