diff --git a/test/game/components/board_test.dart b/test/game/components/board_test.dart
index 2f51b2b1..3db3edca 100644
--- a/test/game/components/board_test.dart
+++ b/test/game/components/board_test.dart
@@ -9,7 +9,7 @@ import '../../helpers/helpers.dart';
 
 void main() {
   TestWidgetsFlutterBinding.ensureInitialized();
-  final flameTester = FlameTester(PinballGameTest.create);
+  final flameTester = FlameTester(PinballGameTest.new);
 
   group('Board', () {
     flameTester.test(
diff --git a/test/game/components/bonus_word_test.dart b/test/game/components/bonus_word_test.dart
index 7d73b6bc..5677466e 100644
--- a/test/game/components/bonus_word_test.dart
+++ b/test/game/components/bonus_word_test.dart
@@ -12,7 +12,7 @@ import '../../helpers/helpers.dart';
 
 void main() {
   TestWidgetsFlutterBinding.ensureInitialized();
-  final flameTester = FlameTester(PinballGameTest.create);
+  final flameTester = FlameTester(PinballGameTest.new);
 
   group('BonusWord', () {
     flameTester.test(
@@ -118,7 +118,7 @@ void main() {
   });
 
   group('BonusLetter', () {
-    final flameTester = FlameTester(PinballGameTest.create);
+    final flameTester = FlameTester(PinballGameTest.new);
 
     flameTester.test(
       'loads correctly',
@@ -198,7 +198,7 @@ void main() {
 
       final flameBlocTester = FlameBlocTester<PinballGame, GameBloc>(
         // TODO(alestiago): Use TestGame once BonusLetter has controller.
-        gameBuilder: PinballGameTest.create,
+        gameBuilder: PinballGameTest.new,
         blocBuilder: () => gameBloc,
       );
 
diff --git a/test/game/components/controlled_ball_test.dart b/test/game/components/controlled_ball_test.dart
index f9494543..2574d75a 100644
--- a/test/game/components/controlled_ball_test.dart
+++ b/test/game/components/controlled_ball_test.dart
@@ -13,7 +13,7 @@ import '../../helpers/helpers.dart';
 
 void main() {
   TestWidgetsFlutterBinding.ensureInitialized();
-  final flameTester = FlameTester(PinballGameTest.create);
+  final flameTester = FlameTester(PinballGameTest.new);
 
   group('BonusBallController', () {
     late Ball ball;
@@ -67,7 +67,7 @@ void main() {
       });
 
       final flameBlocTester = FlameBlocTester<PinballGame, GameBloc>(
-        gameBuilder: PinballGameTest.create,
+        gameBuilder: PinballGameTest.new,
         blocBuilder: () => gameBloc,
       );
 
diff --git a/test/game/components/controlled_flipper_test.dart b/test/game/components/controlled_flipper_test.dart
index eabeca5e..f24fd611 100644
--- a/test/game/components/controlled_flipper_test.dart
+++ b/test/game/components/controlled_flipper_test.dart
@@ -10,7 +10,7 @@ import '../../helpers/helpers.dart';
 
 void main() {
   TestWidgetsFlutterBinding.ensureInitialized();
-  final flameTester = FlameTester(PinballGameTest.create);
+  final flameTester = FlameTester(PinballGameTest.new);
 
   group('FlipperController', () {
     group('onKeyEvent', () {
diff --git a/test/game/components/flutter_forest_test.dart b/test/game/components/flutter_forest_test.dart
index da3f4fee..60c55be9 100644
--- a/test/game/components/flutter_forest_test.dart
+++ b/test/game/components/flutter_forest_test.dart
@@ -25,7 +25,7 @@ void beginContact(Forge2DGame game, BodyComponent bodyA, BodyComponent bodyB) {
 
 void main() {
   TestWidgetsFlutterBinding.ensureInitialized();
-  final flameTester = FlameTester(EmptyPinballGame.create);
+  final flameTester = FlameTester(EmptyPinballGameTest.new);
 
   group('FlutterForest', () {
     flameTester.test(
@@ -146,7 +146,7 @@ void main() {
       });
 
       final flameBlocTester = FlameBlocTester<PinballGame, GameBloc>(
-        gameBuilder: EmptyPinballGame.create,
+        gameBuilder: EmptyPinballGameTest.new,
         blocBuilder: () => gameBloc,
       );
 
diff --git a/test/game/pinball_game_test.dart b/test/game/pinball_game_test.dart
index 52008074..f418bad0 100644
--- a/test/game/pinball_game_test.dart
+++ b/test/game/pinball_game_test.dart
@@ -12,8 +12,8 @@ import '../helpers/helpers.dart';
 void main() {
   group('PinballGame', () {
     TestWidgetsFlutterBinding.ensureInitialized();
-    final flameTester = FlameTester(PinballGameTest.create);
-    final debugModeFlameTester = FlameTester(DebugPinballGameTest.create);
+    final flameTester = FlameTester(PinballGameTest.new);
+    final debugModeFlameTester = FlameTester(DebugPinballGameTest.new);
 
     // TODO(alestiago): test if [PinballGame] registers
     // [BallScorePointsCallback] once the following issue is resolved:
diff --git a/test/helpers/extensions.dart b/test/helpers/extensions.dart
index 4842bc7f..15ae59e9 100644
--- a/test/helpers/extensions.dart
+++ b/test/helpers/extensions.dart
@@ -1,36 +1,25 @@
-import 'package:flutter/services.dart';
 import 'package:pinball/game/game.dart';
 import 'package:pinball_theme/pinball_theme.dart';
 
-/// [PinballGame] extension to reduce boilerplate in tests.
-extension PinballGameTest on PinballGame {
-  /// Create [PinballGame] with default [PinballTheme].
-  static PinballGame create() => PinballGame(
-        theme: const PinballTheme(
-          characterTheme: DashTheme(),
-        ),
-      )..images.prefix = '';
+class PinballGameTest extends PinballGame {
+  PinballGameTest()
+      : super(
+          theme: const PinballTheme(
+            characterTheme: DashTheme(),
+          ),
+        );
 }
 
-/// [DebugPinballGame] extension to reduce boilerplate in tests.
-extension DebugPinballGameTest on DebugPinballGame {
-  /// Create [PinballGame] with default [PinballTheme].
-  static DebugPinballGame create() => DebugPinballGame(
-        theme: const PinballTheme(
-          characterTheme: DashTheme(),
-        ),
-      );
+class DebugPinballGameTest extends DebugPinballGame {
+  DebugPinballGameTest()
+      : super(
+          theme: const PinballTheme(
+            characterTheme: DashTheme(),
+          ),
+        );
 }
 
-class EmptyPinballGame extends PinballGame {
-  EmptyPinballGame({required PinballTheme theme}) : super(theme: theme);
-
+class EmptyPinballGameTest extends PinballGameTest {
   @override
   Future<void> onLoad() async {}
-
-  static PinballGame create() => EmptyPinballGame(
-        theme: const PinballTheme(
-          characterTheme: DashTheme(),
-        ),
-      );
 }