diff --git a/packages/leaderboard_repository/lib/src/leaderboard_repository.dart b/packages/leaderboard_repository/lib/src/leaderboard_repository.dart
index 30f6810f..9d8b2434 100644
--- a/packages/leaderboard_repository/lib/src/leaderboard_repository.dart
+++ b/packages/leaderboard_repository/lib/src/leaderboard_repository.dart
@@ -72,6 +72,20 @@ class FetchPlayerRankingException extends LeaderboardException {
         );
 }
 
+/// {@template fetch_prohibited_initials_exception}
+/// Exception thrown when failure occurs while fetching prohibited initials.
+/// {@endtemplate}
+class FetchProhibitedInitialsException extends LeaderboardException {
+  /// {@macro fetch_prohibited_initials_exception}
+  const FetchProhibitedInitialsException(
+    Object error,
+    StackTrace stackTrace,
+  ) : super(
+          error,
+          stackTrace,
+        );
+}
+
 /// {@template leaderboard_repository}
 /// Repository to access leaderboard data in Firebase Cloud Firestore.
 /// {@endtemplate}
@@ -152,4 +166,25 @@ class LeaderboardRepository {
       throw FetchPlayerRankingException(error, stackTrace);
     }
   }
+
+  /// Determines if the given [initials] are allowed.
+  Future<bool> areInitialsAllowed({required String initials}) async {
+    // Initials can only be three uppercase A-Z letters
+    final initialsRegex = RegExp(r'^[A-Z]{3}$');
+    if (!initialsRegex.hasMatch(initials)) {
+      return false;
+    }
+
+    try {
+      final document = await _firebaseFirestore
+          .collection('prohibitedInitials')
+          .doc('list')
+          .get();
+      final prohibitedInitials =
+          document.get('prohibitedInitials') as List<String>;
+      return !prohibitedInitials.contains(initials);
+    } on Exception catch (error, stackTrace) {
+      throw FetchProhibitedInitialsException(error, stackTrace);
+    }
+  }
 }
diff --git a/packages/leaderboard_repository/test/src/leaderboard_repository_test.dart b/packages/leaderboard_repository/test/src/leaderboard_repository_test.dart
index 1341d3f4..9d31983f 100644
--- a/packages/leaderboard_repository/test/src/leaderboard_repository_test.dart
+++ b/packages/leaderboard_repository/test/src/leaderboard_repository_test.dart
@@ -21,6 +21,9 @@ class MockQueryDocumentSnapshot extends Mock
 class MockDocumentReference extends Mock
     implements DocumentReference<Map<String, dynamic>> {}
 
+class MockDocumentSnapshot extends Mock
+    implements DocumentSnapshot<Map<String, dynamic>> {}
+
 void main() {
   group('LeaderboardRepository', () {
     late FirebaseFirestore firestore;
@@ -223,5 +226,94 @@ void main() {
         );
       });
     });
+
+    group('areInitialsAllowed', () {
+      late LeaderboardRepository leaderboardRepository;
+      late CollectionReference<Map<String, dynamic>> collectionReference;
+      late DocumentReference<Map<String, dynamic>> documentReference;
+      late DocumentSnapshot<Map<String, dynamic>> documentSnapshot;
+
+      setUp(() async {
+        collectionReference = MockCollectionReference();
+        documentReference = MockDocumentReference();
+        documentSnapshot = MockDocumentSnapshot();
+        leaderboardRepository = LeaderboardRepository(firestore);
+
+        when(() => firestore.collection('prohibitedInitials'))
+            .thenReturn(collectionReference);
+        when(() => collectionReference.doc('list'))
+            .thenReturn(documentReference);
+        when(() => documentReference.get())
+            .thenAnswer((_) async => documentSnapshot);
+        when<dynamic>(() => documentSnapshot.get('prohibitedInitials'))
+            .thenReturn(['BAD']);
+      });
+
+      test('returns true if initials are three letters and allowed', () async {
+        final isUsernameAllowedResponse =
+            await leaderboardRepository.areInitialsAllowed(
+          initials: 'ABC',
+        );
+        expect(
+          isUsernameAllowedResponse,
+          isTrue,
+        );
+      });
+
+      test(
+        'returns false if initials are shorter than 3 characters',
+        () async {
+          final areInitialsAllowedResponse =
+              await leaderboardRepository.areInitialsAllowed(initials: 'AB');
+          expect(areInitialsAllowedResponse, isFalse);
+        },
+      );
+
+      test(
+        'returns false if initials are longer than 3 characters',
+        () async {
+          final areInitialsAllowedResponse =
+              await leaderboardRepository.areInitialsAllowed(initials: 'ABCD');
+          expect(areInitialsAllowedResponse, isFalse);
+        },
+      );
+
+      test(
+        'returns false if initials contain a lowercase letter',
+        () async {
+          final areInitialsAllowedResponse =
+              await leaderboardRepository.areInitialsAllowed(initials: 'AbC');
+          expect(areInitialsAllowedResponse, isFalse);
+        },
+      );
+
+      test(
+        'returns false if initials contain a special character',
+        () async {
+          final areInitialsAllowedResponse =
+              await leaderboardRepository.areInitialsAllowed(initials: 'A@C');
+          expect(areInitialsAllowedResponse, isFalse);
+        },
+      );
+
+      test('returns false if initials are forbidden', () async {
+        final areInitialsAllowedResponse =
+            await leaderboardRepository.areInitialsAllowed(initials: 'BAD');
+        expect(areInitialsAllowedResponse, isFalse);
+      });
+
+      test(
+        'throws FetchProhibitedInitialsException when Exception occurs '
+        'when trying to retrieve information from firestore',
+        () async {
+          when(() => firestore.collection('prohibitedInitials'))
+              .thenThrow(Exception('oops'));
+          expect(
+            () => leaderboardRepository.areInitialsAllowed(initials: 'ABC'),
+            throwsA(isA<FetchProhibitedInitialsException>()),
+          );
+        },
+      );
+    });
   });
 }
diff --git a/packages/pinball_components/assets/images/boundary/bottom.png b/packages/pinball_components/assets/images/boundary/bottom.png
index 90bfa493..806f7051 100644
Binary files a/packages/pinball_components/assets/images/boundary/bottom.png and b/packages/pinball_components/assets/images/boundary/bottom.png differ
diff --git a/packages/pinball_components/assets/images/dino/bottom-wall.png b/packages/pinball_components/assets/images/dino/bottom-wall.png
index 9aa42e12..6a20f1a7 100644
Binary files a/packages/pinball_components/assets/images/dino/bottom-wall.png and b/packages/pinball_components/assets/images/dino/bottom-wall.png differ
diff --git a/packages/pinball_components/assets/images/dino/top-wall.png b/packages/pinball_components/assets/images/dino/top-wall.png
index 18b92541..cb4c82f2 100644
Binary files a/packages/pinball_components/assets/images/dino/top-wall.png and b/packages/pinball_components/assets/images/dino/top-wall.png differ
diff --git a/packages/pinball_components/lib/src/components/dino_walls.dart b/packages/pinball_components/lib/src/components/dino_walls.dart
index ca748799..cf6d572d 100644
--- a/packages/pinball_components/lib/src/components/dino_walls.dart
+++ b/packages/pinball_components/lib/src/components/dino_walls.dart
@@ -34,24 +34,21 @@ class _DinoTopWall extends BodyComponent with InitialPosition {
   }
 
   List<FixtureDef> _createFixtureDefs() {
-    final fixturesDef = <FixtureDef>[];
-
     final topStraightShape = EdgeShape()
       ..set(
         Vector2(28.65, -35.1),
         Vector2(29.5, -35.1),
       );
     final topStraightFixtureDef = FixtureDef(topStraightShape);
-    fixturesDef.add(topStraightFixtureDef);
 
     final topCurveShape = BezierCurveShape(
       controlPoints: [
         topStraightShape.vertex1,
-        Vector2(17.4, -26.38),
-        Vector2(25.5, -20.7),
+        Vector2(18.8, -27),
+        Vector2(26.6, -21),
       ],
     );
-    fixturesDef.add(FixtureDef(topCurveShape));
+    final topCurveFixtureDef = FixtureDef(topCurveShape);
 
     final middleCurveShape = BezierCurveShape(
       controlPoints: [
@@ -60,16 +57,16 @@ class _DinoTopWall extends BodyComponent with InitialPosition {
         Vector2(26.8, -19.5),
       ],
     );
-    fixturesDef.add(FixtureDef(middleCurveShape));
+    final middleCurveFixtureDef = FixtureDef(middleCurveShape);
 
     final bottomCurveShape = BezierCurveShape(
       controlPoints: [
         middleCurveShape.vertices.last,
-        Vector2(21.5, -15.8),
-        Vector2(25.8, -14.8),
+        Vector2(23, -15),
+        Vector2(27, -15),
       ],
     );
-    fixturesDef.add(FixtureDef(bottomCurveShape));
+    final bottomCurveFixtureDef = FixtureDef(bottomCurveShape);
 
     final bottomStraightShape = EdgeShape()
       ..set(
@@ -77,9 +74,14 @@ class _DinoTopWall extends BodyComponent with InitialPosition {
         Vector2(31, -14.5),
       );
     final bottomStraightFixtureDef = FixtureDef(bottomStraightShape);
-    fixturesDef.add(bottomStraightFixtureDef);
 
-    return fixturesDef;
+    return [
+      topStraightFixtureDef,
+      topCurveFixtureDef,
+      middleCurveFixtureDef,
+      bottomCurveFixtureDef,
+      bottomStraightFixtureDef,
+    ];
   }
 
   @override
@@ -106,12 +108,14 @@ class _DinoTopWallSpriteComponent extends SpriteComponent with HasGameRef {
   @override
   Future<void> onLoad() async {
     await super.onLoad();
-    final sprite = await gameRef.loadSprite(
-      Assets.images.dino.topWall.keyName,
+    final sprite = Sprite(
+      gameRef.images.fromCache(
+        Assets.images.dino.topWall.keyName,
+      ),
     );
     this.sprite = sprite;
     size = sprite.originalSize / 10;
-    position = Vector2(22, -41.8);
+    position = Vector2(22.8, -38.9);
   }
 }
 
@@ -129,69 +133,56 @@ class _DinoBottomWall extends BodyComponent with InitialPosition {
   }
 
   List<FixtureDef> _createFixtureDefs() {
-    final fixturesDef = <FixtureDef>[];
     const restitution = 1.0;
 
-    final topStraightControlPoints = [
-      Vector2(32.4, -8.8),
-      Vector2(25, -7.7),
-    ];
     final topStraightShape = EdgeShape()
       ..set(
-        topStraightControlPoints.first,
-        topStraightControlPoints.last,
+        Vector2(32.4, -8.8),
+        Vector2(25, -7.7),
       );
     final topStraightFixtureDef = FixtureDef(
       topStraightShape,
       restitution: restitution,
     );
-    fixturesDef.add(topStraightFixtureDef);
 
-    final topLeftCurveControlPoints = [
-      topStraightControlPoints.last,
-      Vector2(21.8, -7),
-      Vector2(29.5, 13.8),
-    ];
     final topLeftCurveShape = BezierCurveShape(
-      controlPoints: topLeftCurveControlPoints,
+      controlPoints: [
+        topStraightShape.vertex2,
+        Vector2(21.8, -7),
+        Vector2(29.8, 13.8),
+      ],
     );
     final topLeftCurveFixtureDef = FixtureDef(
       topLeftCurveShape,
       restitution: restitution,
     );
-    fixturesDef.add(topLeftCurveFixtureDef);
 
-    final bottomLeftStraightControlPoints = [
-      topLeftCurveControlPoints.last,
-      Vector2(31.8, 44.1),
-    ];
     final bottomLeftStraightShape = EdgeShape()
       ..set(
-        bottomLeftStraightControlPoints.first,
-        bottomLeftStraightControlPoints.last,
+        topLeftCurveShape.vertices.last,
+        Vector2(31.9, 44.1),
       );
     final bottomLeftStraightFixtureDef = FixtureDef(
       bottomLeftStraightShape,
       restitution: restitution,
     );
-    fixturesDef.add(bottomLeftStraightFixtureDef);
 
-    final bottomStraightControlPoints = [
-      bottomLeftStraightControlPoints.last,
-      Vector2(37.8, 44.1),
-    ];
     final bottomStraightShape = EdgeShape()
       ..set(
-        bottomStraightControlPoints.first,
-        bottomStraightControlPoints.last,
+        bottomLeftStraightShape.vertex2,
+        Vector2(37.8, 44.1),
       );
     final bottomStraightFixtureDef = FixtureDef(
       bottomStraightShape,
       restitution: restitution,
     );
-    fixturesDef.add(bottomStraightFixtureDef);
 
-    return fixturesDef;
+    return [
+      topStraightFixtureDef,
+      topLeftCurveFixtureDef,
+      bottomLeftStraightFixtureDef,
+      bottomStraightFixtureDef,
+    ];
   }
 
   @override
@@ -212,8 +203,10 @@ class _DinoBottomWallSpriteComponent extends SpriteComponent with HasGameRef {
   @override
   Future<void> onLoad() async {
     await super.onLoad();
-    final sprite = await gameRef.loadSprite(
-      Assets.images.dino.bottomWall.keyName,
+    final sprite = Sprite(
+      gameRef.images.fromCache(
+        Assets.images.dino.bottomWall.keyName,
+      ),
     );
     this.sprite = sprite;
     size = sprite.originalSize / 10;
diff --git a/packages/pinball_components/sandbox/lib/main.dart b/packages/pinball_components/sandbox/lib/main.dart
index 8709d694..e5f7f177 100644
--- a/packages/pinball_components/sandbox/lib/main.dart
+++ b/packages/pinball_components/sandbox/lib/main.dart
@@ -29,6 +29,7 @@ void main() {
   addLaunchRampStories(dashbook);
   addScoreTextStories(dashbook);
   addBackboardStories(dashbook);
+  addDinoWallStories(dashbook);
 
   runApp(dashbook);
 }
diff --git a/packages/pinball_components/sandbox/lib/stories/dino_wall/dino_wall_game.dart b/packages/pinball_components/sandbox/lib/stories/dino_wall/dino_wall_game.dart
new file mode 100644
index 00000000..a6987fcc
--- /dev/null
+++ b/packages/pinball_components/sandbox/lib/stories/dino_wall/dino_wall_game.dart
@@ -0,0 +1,31 @@
+import 'dart:async';
+
+import 'package:flame/input.dart';
+import 'package:pinball_components/pinball_components.dart';
+import 'package:pinball_flame/pinball_flame.dart';
+import 'package:sandbox/stories/ball/basic_ball_game.dart';
+
+class DinoWallGame extends BallGame {
+  DinoWallGame() : super();
+
+  static const description = '''
+    Shows how DinoWalls are rendered.
+
+    - Activate the "trace" parameter to overlay the body.
+    - Tap anywhere on the screen to spawn a ball into the game.
+''';
+
+  @override
+  Future<void> onLoad() async {
+    await super.onLoad();
+
+    await images.loadAll([
+      Assets.images.dino.topWall.keyName,
+      Assets.images.dino.bottomWall.keyName,
+    ]);
+
+    await addFromBlueprint(DinoWalls());
+    camera.followVector2(Vector2.zero());
+    await traceAllBodies();
+  }
+}
diff --git a/packages/pinball_components/sandbox/lib/stories/dino_wall/stories.dart b/packages/pinball_components/sandbox/lib/stories/dino_wall/stories.dart
new file mode 100644
index 00000000..e24d26cc
--- /dev/null
+++ b/packages/pinball_components/sandbox/lib/stories/dino_wall/stories.dart
@@ -0,0 +1,11 @@
+import 'package:dashbook/dashbook.dart';
+import 'package:sandbox/common/common.dart';
+import 'package:sandbox/stories/dino_wall/dino_wall_game.dart';
+
+void addDinoWallStories(Dashbook dashbook) {
+  dashbook.storiesOf('DinoWall').addGame(
+        title: 'Traced',
+        description: DinoWallGame.description,
+        gameBuilder: (_) => DinoWallGame(),
+      );
+}
diff --git a/packages/pinball_components/sandbox/lib/stories/stories.dart b/packages/pinball_components/sandbox/lib/stories/stories.dart
index 90c38150..d8103b4d 100644
--- a/packages/pinball_components/sandbox/lib/stories/stories.dart
+++ b/packages/pinball_components/sandbox/lib/stories/stories.dart
@@ -4,6 +4,7 @@ export 'ball/stories.dart';
 export 'baseboard/stories.dart';
 export 'boundaries/stories.dart';
 export 'chrome_dino/stories.dart';
+export 'dino_wall/stories.dart';
 export 'effects/stories.dart';
 export 'flipper/stories.dart';
 export 'flutter_forest/stories.dart';
diff --git a/packages/pinball_components/test/src/components/dino_walls_test.dart b/packages/pinball_components/test/src/components/dino_walls_test.dart
index b3a58264..ff64fb00 100644
--- a/packages/pinball_components/test/src/components/dino_walls_test.dart
+++ b/packages/pinball_components/test/src/components/dino_walls_test.dart
@@ -11,15 +11,23 @@ import '../../helpers/helpers.dart';
 void main() {
   group('DinoWalls', () {
     TestWidgetsFlutterBinding.ensureInitialized();
-    final flameTester = FlameTester(TestGame.new);
+    final assets = [
+      Assets.images.dino.topWall.keyName,
+      Assets.images.dino.bottomWall.keyName,
+    ];
+    final flameTester = FlameTester(() => TestGame(assets));
 
     flameTester.testGameWidget(
       'renders correctly',
       setUp: (game, tester) async {
+        await game.images.loadAll(assets);
         await game.addFromBlueprint(DinoWalls());
+        await game.ready();
+
         game.camera.followVector2(Vector2.zero());
         game.camera.zoom = 6.5;
-        await game.ready();
+
+        await tester.pump();
       },
       verify: (game, tester) async {
         await expectLater(
diff --git a/packages/pinball_components/test/src/components/golden/boundaries.png b/packages/pinball_components/test/src/components/golden/boundaries.png
index 6cb24bbd..2612679a 100644
Binary files a/packages/pinball_components/test/src/components/golden/boundaries.png and b/packages/pinball_components/test/src/components/golden/boundaries.png differ
diff --git a/packages/pinball_components/test/src/components/golden/dino-walls.png b/packages/pinball_components/test/src/components/golden/dino-walls.png
index 8c2ee569..5956b43b 100644
Binary files a/packages/pinball_components/test/src/components/golden/dino-walls.png and b/packages/pinball_components/test/src/components/golden/dino-walls.png differ
diff --git a/packages/share_repository/lib/share_repository.dart b/packages/share_repository/lib/share_repository.dart
index 0b6d064c..0a68aff4 100644
--- a/packages/share_repository/lib/share_repository.dart
+++ b/packages/share_repository/lib/share_repository.dart
@@ -1,3 +1,4 @@
 library share_repository;
 
+export 'src/models/models.dart';
 export 'src/share_repository.dart';
diff --git a/packages/share_repository/lib/src/models/models.dart b/packages/share_repository/lib/src/models/models.dart
new file mode 100644
index 00000000..26819946
--- /dev/null
+++ b/packages/share_repository/lib/src/models/models.dart
@@ -0,0 +1 @@
+export 'share_platform.dart';
diff --git a/packages/share_repository/lib/src/models/share_platform.dart b/packages/share_repository/lib/src/models/share_platform.dart
new file mode 100644
index 00000000..054a4f15
--- /dev/null
+++ b/packages/share_repository/lib/src/models/share_platform.dart
@@ -0,0 +1,8 @@
+/// The platform that is being used to share a score.
+enum SharePlatform {
+  /// Twitter platform.
+  twitter,
+
+  /// Facebook platform.
+  facebook,
+}
diff --git a/packages/share_repository/lib/src/share_repository.dart b/packages/share_repository/lib/src/share_repository.dart
index 6c1f36d0..6e6679c2 100644
--- a/packages/share_repository/lib/src/share_repository.dart
+++ b/packages/share_repository/lib/src/share_repository.dart
@@ -1,7 +1,30 @@
+import 'package:share_repository/share_repository.dart';
+
 /// {@template share_repository}
 /// Repository to facilitate sharing scores.
 /// {@endtemplate}
 class ShareRepository {
   /// {@macro share_repository}
-  const ShareRepository();
+  const ShareRepository({
+    required String appUrl,
+  }) : _appUrl = appUrl;
+
+  final String _appUrl;
+
+  /// Returns a url to share the [value] on the given [platform].
+  ///
+  /// The returned url can be opened using the [url_launcher](https://pub.dev/packages/url_launcher) package.
+  String shareText({
+    required String value,
+    required SharePlatform platform,
+  }) {
+    final encodedUrl = Uri.encodeComponent(_appUrl);
+    final encodedShareText = Uri.encodeComponent(value);
+    switch (platform) {
+      case SharePlatform.twitter:
+        return 'https://twitter.com/intent/tweet?url=$encodedUrl&text=$encodedShareText';
+      case SharePlatform.facebook:
+        return 'https://www.facebook.com/sharer.php?u=$encodedUrl&quote=$encodedShareText';
+    }
+  }
 }
diff --git a/packages/share_repository/test/src/share_repository_test.dart b/packages/share_repository/test/src/share_repository_test.dart
index e6cc536b..bdb2c517 100644
--- a/packages/share_repository/test/src/share_repository_test.dart
+++ b/packages/share_repository/test/src/share_repository_test.dart
@@ -4,8 +4,38 @@ import 'package:test/test.dart';
 
 void main() {
   group('ShareRepository', () {
+    const appUrl = 'https://fakeurl.com/';
+    late ShareRepository shareRepository;
+
+    setUp(() {
+      shareRepository = ShareRepository(appUrl: appUrl);
+    });
+
     test('can be instantiated', () {
-      expect(ShareRepository(), isNotNull);
+      expect(ShareRepository(appUrl: appUrl), isNotNull);
+    });
+
+    group('shareText', () {
+      const value = 'hello world!';
+      test('returns the correct share url for twitter', () async {
+        const shareTextUrl =
+            'https://twitter.com/intent/tweet?url=https%3A%2F%2Ffakeurl.com%2F&text=hello%20world!';
+        final shareTextResult = shareRepository.shareText(
+          value: value,
+          platform: SharePlatform.twitter,
+        );
+        expect(shareTextResult, equals(shareTextUrl));
+      });
+
+      test('returns the correct share url for facebook', () async {
+        const shareTextUrl =
+            'https://www.facebook.com/sharer.php?u=https%3A%2F%2Ffakeurl.com%2F&quote=hello%20world!';
+        final shareTextResult = shareRepository.shareText(
+          value: value,
+          platform: SharePlatform.facebook,
+        );
+        expect(shareTextResult, equals(shareTextUrl));
+      });
     });
   });
 }
diff --git a/test/game/pinball_game_test.dart b/test/game/pinball_game_test.dart
index 20b6a2cd..f5d27b31 100644
--- a/test/game/pinball_game_test.dart
+++ b/test/game/pinball_game_test.dart
@@ -56,6 +56,8 @@ void main() {
     Assets.images.boundary.bottom.keyName,
     Assets.images.slingshot.upper.keyName,
     Assets.images.slingshot.lower.keyName,
+    Assets.images.dino.topWall.keyName,
+    Assets.images.dino.bottomWall.keyName,
   ];
   final flameTester = FlameTester(() => PinballTestGame(assets));
   final debugModeFlameTester = FlameTester(() => DebugPinballTestGame(assets));