diff --git a/documentation/draw.md b/documentation/draw.md
new file mode 100644
index 0000000..be7b5f9
--- /dev/null
+++ b/documentation/draw.md
@@ -0,0 +1,169 @@
+# Drawing with GraphX™
+
+In **GraphX™** we have a couple of classes for rendering things.
+These are `Shape` and `Sprite` .
+
+Those classes have an initial method wich is called when the object
+is added to the stage, this method, is named by the way `addedToStage` .
+there we handle the drawing of our object.
+
+For example, a simple rendering of a square can be:
+
+``` dart
+@override
+void addedToStage(){
+  graphics.beginFill(0x0000ff, .6)
+  ..drawRoundRect(100, 100, 40, 40, 4)
+  ..endFill();
+}
+```
+
+Output: 
+
+![basic_square](https://user-images.githubusercontent.com/44511181/99677710-c8d7b300-2a58-11eb-849e-8a3a5e79f144.jpg)
+
+Always when we want to draw a shape, we have to start with the
+`beginFill()` method.
+
+To draw a circle:
+
+``` dart
+@override
+void addedToStage() {
+    graphics.beginFill(0x0000ff, .6)
+    ..drawCircle(
+        200,
+        200,
+        120,
+    ).endFill();
+}
+```
+
+Output: 
+
+![basic_circle](https://user-images.githubusercontent.com/44511181/99679843-2a991c80-2a5b-11eb-95cb-0c77318dc9cd.jpg)
+
+To draw a line, it changes a little bit, use `lineStyle` instead, where we configure the `thickness` and the `color` with a hex value.
+
+``` dart
+graphics.lineStyle(4.0, Colors.green.value);
+```
+
+Then the `moveTo(x,y)` method allow us to move the *pencil* to a particular place for start drawing, from there, we can use the `lineTo(x,y)` .
+
+``` dart
+@override
+void addedToStage() {
+    graphics.lineStyle(4.0, Colors.green.value)
+        ..moveTo(100, 100)
+        ..lineTo(100, 200)
+        ..endFill();
+}
+```
+
+![basic_line](https://user-images.githubusercontent.com/44511181/99682895-7f8a6200-2a5e-11eb-97c9-718a552d26c1.jpg)
+
+The `closePath()` method, provide us a way to close the shape.
+
+This is a shape without the `closePath()`
+
+``` dart
+@override
+void addedToStage() {
+graphics.lineStyle(4.0, Colors.green.value)
+    ..moveTo(100, 100)
+    ..lineTo(100, 200)
+    ..lineTo(200, 100)
+    ..lineTo(100, 100)
+    ..endFill();
+ }
+
+```
+
+Output: 
+
+![closePath](https://user-images.githubusercontent.com/44511181/99716119-7b723a80-2a86-11eb-8460-ad5aec26107e.jpg)
+
+and with the `closePath()`
+
+``` dart
+@override
+void addedToStage() {
+    graphics.lineStyle(4.0, Colors.green.value)
+    ..moveTo(100, 100)
+    ..lineTo(100, 200)
+    ..lineTo(200, 100)
+    ..closePath()
+    ..endFill();
+}
+
+```
+
+Output: 
+
+![closePathFinal](https://user-images.githubusercontent.com/44511181/99716537-fdfafa00-2a86-11eb-9167-e6e410320922.jpg)
+
+### Handling multiple objects
+
+To add multiple objects in the same scene, just need to create a `shape` and add it into the stage. This new shape has also a `graphics` property where we can draw.
+
+``` dart
+@override
+void addedToStage() {
+    final shape1 = Shape();
+    final shape2 = Shape();
+    shape1.graphics
+        .beginFill(
+            Colors.deepOrange.value,
+        )
+        .drawStar(100, 100, 5, 60)
+        .endFill();
+    shape2.graphics
+        .beginFill(
+            Colors.deepOrange.value,
+        )
+        .drawStar(200, 200, 5, 60)
+        .endFill();
+    addChild(shape1);
+    addChild(shape2);
+}
+```
+
+Output:
+
+![multipleObjects](https://user-images.githubusercontent.com/44511181/99721646-4c5fc700-2a8e-11eb-8445-1d8f1c1d68a8.jpg)
+
+After the shape is created, we can change some properties, like
+the 
+
+* scale
+* alpha
+* etc.
+
+``` dart
+@override
+void addedToStage() {
+    final shape1 = Shape();
+    final shape2 = Shape();
+    shape1.graphics
+        .beginFill(
+            Colors.deepOrange.value,
+        )
+        .drawStar(100, 100, 5, 60);
+    shape2.graphics
+        .beginFill(
+            Colors.deepOrange.value,
+        )
+        .drawStar(200, 200, 5, 60);
+    shape1.scale = 1.2;
+    shape1.alpha = .9;
+    shape2.x = 150;
+    shape2.scaleY = 1.3;
+    addChild(shape1);
+    addChild(shape2);
+}
+```
+
+Output:
+
+![properties_changed](https://user-images.githubusercontent.com/44511181/99722706-cfcde800-2a8f-11eb-9999-2a0301f36e2b.jpg)
diff --git a/documentation/events.md b/documentation/events.md
new file mode 100644
index 0000000..235bf8a
--- /dev/null
+++ b/documentation/events.md
@@ -0,0 +1,20 @@
+# Events with **GraphX™**
+
+We have multiples callBacks to handle and add interactivity to our shapes like:
+
+ * onMouseClick
+ * onMouseDoubleClick
+ * onMouseDown
+ * onMouseUp
+ * etc.
+
+Before start, we 
+ 
+In each event we can use the `add()` method or `addOnce`
+wich also provide you the event itSelf where you can add more interactivity.
+ 
+
+
+
+
+ 
diff --git a/lib/src/core/scene_controller.dart b/lib/src/core/scene_controller.dart
index cc750a3..bdb4db7 100644
--- a/lib/src/core/scene_controller.dart
+++ b/lib/src/core/scene_controller.dart
@@ -109,6 +109,7 @@ class SceneController {
   InputConverter $inputConverter;
 
   SceneConfig get config => _config;
+
   final _config = SceneConfig();
   int id = -1;
   bool _isInited = false;
@@ -157,6 +158,15 @@ class SceneController {
     _ticker = null;
   }
 
+  set config(SceneConfig sceneConfig) {
+    _config.setTo(
+      sceneIsComplex: sceneConfig.painterIsComplex,
+      useKeyboard: sceneConfig.useKeyboard,
+      usePointer: sceneConfig.usePointer,
+      useTicker: sceneConfig.useTicker,
+    );
+  }
+
   CustomPainter buildBackPainter() => back?.buildPainter();
 
   CustomPainter buildFrontPainter() => front?.buildPainter();
@@ -175,14 +185,25 @@ class SceneController {
 
   SceneController._();
 
-  static SceneController withLayers({SceneRoot back, SceneRoot front}) {
+  static SceneController withLayers({
+    Sprite back,
+    Sprite front,
+    SceneConfig backConfig,
+    SceneConfig frontConfig,
+  }) {
     assert(back != null || front != null);
     final controller = SceneController._();
     if (back != null) {
       controller.back = ScenePainter(controller, back);
+      if (backConfig != null) {
+        controller.back.core.config = backConfig;
+      }
     }
     if (front != null) {
       controller.front = ScenePainter(controller, front);
+      if (frontConfig != null) {
+        controller.back.core.config = frontConfig;
+      }
     }
     return controller;
   }
diff --git a/lib/src/core/scene_painter.dart b/lib/src/core/scene_painter.dart
index fc46b5d..31ddc96 100644
--- a/lib/src/core/scene_painter.dart
+++ b/lib/src/core/scene_painter.dart
@@ -4,68 +4,68 @@ import 'package:flutter/widgets.dart';
 
 import '../../graphx.dart';
 
-class SceneRoot extends Sprite {
-  ScenePainter scene;
-
-  static SceneRoot get current {
-    return ScenePainter.current.root;
-  }
-
-  bool _ready = false;
-
-  bool get isReady => _ready;
-
-  bool _autoUpdateAndRender;
-  bool _useTicker;
-  bool _useKeyboard;
-  bool _usePointer;
-  bool _sceneIsComplex;
-
-  /// You can config the scene in [init()] or in your class constructor.
-  void config({
-    bool autoUpdateAndRender = false,
-    bool useTicker,
-    bool useKeyboard,
-    bool usePointer,
-    bool sceneIsComplex,
-  }) {
-    _autoUpdateAndRender = autoUpdateAndRender;
-    _useTicker = useTicker;
-    _useKeyboard = useKeyboard;
-    _usePointer = usePointer;
-    _sceneIsComplex = sceneIsComplex;
-    _applyConfig();
-  }
-
-  void _applyConfig() {
-    if (scene == null) return;
-    if (_ready) {
-      throw 'You can not initScene() after ready() has happened. '
-          'Is only allowed during (or before) init().';
-    }
-//    scene.shouldRepaint = needsRepaint;
-    scene.autoUpdateAndRender = _autoUpdateAndRender ?? false;
-    if (scene.autoUpdateAndRender) {
-      _useTicker = true;
-    }
-    scene.core.config.setTo(
-      useTicker: _useTicker,
-      useKeyboard: _useKeyboard,
-      usePointer: _usePointer,
-      sceneIsComplex: _sceneIsComplex,
-    );
-  }
-
-  /// Use to initialize engine properties.
-  @protected
-  void init() {
-    _applyConfig();
-  }
-
-  /// Called when stage is ready.
-  @protected
-  void ready() {}
-}
+// class SceneRoot extends Sprite {
+//   ScenePainter scene;
+
+//   static SceneRoot get current {
+//     return ScenePainter.current.root;
+//   }
+
+//   bool _ready = false;
+
+//   bool get isReady => _ready;
+
+//   bool _autoUpdateAndRender;
+//   bool _useTicker;
+//   bool _useKeyboard;
+//   bool _usePointer;
+//   bool _sceneIsComplex;
+
+//   /// You can config the scene in [init()] or in your class constructor.
+//   void config({
+//     bool autoUpdateAndRender = false,
+//     bool useTicker,
+//     bool useKeyboard,
+//     bool usePointer,
+//     bool sceneIsComplex,
+//   }) {
+//     _autoUpdateAndRender = autoUpdateAndRender;
+//     _useTicker = useTicker;
+//     _useKeyboard = useKeyboard;
+//     _usePointer = usePointer;
+//     _sceneIsComplex = sceneIsComplex;
+//     _applyConfig();
+//   }
+
+//   void _applyConfig() {
+//     if (scene == null) return;
+//     if (_ready) {
+//       throw 'You can not initScene() after ready() has happened. '
+//           'Is only allowed during (or before) init().';
+//     }
+// //    scene.shouldRepaint = needsRepaint;
+//     scene.autoUpdateAndRender = _autoUpdateAndRender ?? false;
+//     if (scene.autoUpdateAndRender) {
+//       _useTicker = true;
+//     }
+//     scene.core.config.setTo(
+//       useTicker: _useTicker,
+//       useKeyboard: _useKeyboard,
+//       usePointer: _usePointer,
+//       sceneIsComplex: _sceneIsComplex,
+//     );
+//   }
+
+//   /// Use to initialize engine properties.
+//   @protected
+//   void init() {
+//     _applyConfig();
+//   }
+
+//   /// Called when stage is ready.
+//   @protected
+//   void ready() {}
+// }
 
 class ScenePainter with EventDispatcherMixin {
   /// Current painter being processed.
@@ -76,7 +76,7 @@ class ScenePainter with EventDispatcherMixin {
 
   /// Access to the `root` DisplayObject that will initialize
   /// the Scene layer.
-  SceneRoot root;
+  Sprite root;
 
   /// Allows to re-paint the internal CustomPainter on every tick()
   /// The flags allow the $render() `tick` process to know if it has to
@@ -129,7 +129,7 @@ class ScenePainter with EventDispatcherMixin {
 
   ScenePainter(this.core, this.root) {
     _stage = Stage(this);
-    root.scene = this;
+    // root.scene = this;
     makeCurrent();
   }
 
diff --git a/lib/src/display/display_object.dart b/lib/src/display/display_object.dart
index 1e78673..ecc99fb 100644
--- a/lib/src/display/display_object.dart
+++ b/lib/src/display/display_object.dart
@@ -12,6 +12,7 @@ import 'stage.dart';
 
 abstract class DisplayObject
     with DisplayListSignalsMixin, RenderSignalMixin, MouseSignalsMixin {
+
   DisplayObjectContainer $parent;
 
   static DisplayObject $currentDrag;
diff --git a/lib/src/display/sprite.dart b/lib/src/display/sprite.dart
index 7613b1d..ab6841e 100644
--- a/lib/src/display/sprite.dart
+++ b/lib/src/display/sprite.dart
@@ -8,6 +8,7 @@ class Sprite extends DisplayObjectContainer {
     return '$runtimeType (Sprite)$msg';
   }
 
+  
   static final _sHelperMatrix = GxMatrix();
 
   Graphics _graphics;
@@ -44,7 +45,6 @@ class Sprite extends DisplayObjectContainer {
 
   @override
   void $applyPaint(Canvas canvas) {
-//    print("Apply paint!");
     if (!$hasVisibleArea) return;
     _graphics?.alpha = worldAlpha;
     _graphics?.paint(canvas);
diff --git a/lib/src/events/callback_params.dart b/lib/src/events/callback_params.dart
index 8198588..4cbdd8a 100644
--- a/lib/src/events/callback_params.dart
+++ b/lib/src/events/callback_params.dart
@@ -1,4 +1,4 @@
-class CallbackParams {
+class CallBackParams {
   List<dynamic> positional;
 
   /// Symbol is represented by the literal # in Dart.
@@ -6,16 +6,19 @@ class CallbackParams {
   /// You'd use {#name: 'roi', #count: 10}.
   Map<Symbol, dynamic> named;
 
-  CallbackParams([this.positional, this.named]);
+  CallBackParams([this.positional, this.named]);
 
-  static CallbackParams parse(Object args) {
+  static CallBackParams parse(Object args) {
     if (args == null) return null;
-    if (args is CallbackParams) return args;
+
+    if (args is CallBackParams) return args;
+
     if (args is List) {
-      return CallbackParams(args);
+      return CallBackParams(args);
     } else if (args is Map) {
-      return CallbackParams(null, args);
+      return CallBackParams(null, args);
     }
-    return CallbackParams([args]);
+
+    return CallBackParams([args]);
   }
 }
diff --git a/lib/src/events/mps.dart b/lib/src/events/mps.dart
index 8a61161..6728ee9 100644
--- a/lib/src/events/mps.dart
+++ b/lib/src/events/mps.dart
@@ -13,7 +13,7 @@ class MPS {
   final _cache = <String, List<Function>>{};
   final _cacheOnce = <String, List<Function>>{};
 
-  void publishParams(String topic, CallbackParams args) {
+  void publishParams(String topic, CallBackParams args) {
 //    final subs = _cache[topic];
 //    subs?.forEach((fn) => Function.apply(fn, args?.positional, args?.named));
 
@@ -158,7 +158,7 @@ class MPS {
     _cacheOnce.remove(topic);
   }
 
-  void emitParams(String topic, CallbackParams args) {
+  void emitParams(String topic, CallBackParams args) {
     void _send(Function fn) =>
         Function.apply(fn, args?.positional, args?.named);
     _cache[topic]?.forEach(_send);
diff --git a/lib/src/events/signal.dart b/lib/src/events/signal.dart
index da47112..44c726f 100644
--- a/lib/src/events/signal.dart
+++ b/lib/src/events/signal.dart
@@ -1,3 +1,7 @@
+/// --- EVENT SIGNAL
+
+typedef EventSignalCallback<T> = void Function(T event);
+
 class Signal {
   final _listenersOnce = <Function>[];
   final _listeners = <Function>[];
@@ -60,10 +64,6 @@ class Signal {
   }
 }
 
-/// --- EVENT SIGNAL
-
-typedef EventSignalCallback<T> = void Function(T);
-
 class EventSignal<T> {
   void call(EventSignalCallback<T> callback) {
     add(callback);
diff --git a/lib/src/extensions/display_object.dart b/lib/src/extensions/display_object.dart
new file mode 100644
index 0000000..430cde6
--- /dev/null
+++ b/lib/src/extensions/display_object.dart
@@ -0,0 +1,43 @@
+import '../../graphx.dart';
+
+extension DisplayObjectHelpers on DisplayObject {
+  void centerInStage() {
+    if (!inStage) return;
+    setPosition(stage.stageWidth / 2, stage.stageHeight / 2);
+  }
+
+  void setProps({
+    Object x,
+    Object y,
+    Object scaleX,
+    Object scaleY,
+    Object scale,
+    Object rotation,
+    Object pivotX,
+    Object pivotY,
+    Object width,
+    Object height,
+    Object skewX,
+    Object skewY,
+    Object alpha,
+    double delay = 0,
+  }) {
+    tween(
+      duration: 0,
+      delay: delay,
+      x: x,
+      y: y,
+      scaleX: scaleX,
+      scaleY: scaleY,
+      scale: scale,
+      rotation: rotation,
+      pivotX: pivotX,
+      pivotY: pivotY,
+      width: width,
+      height: height,
+      skewX: skewX,
+      skewY: skewY,
+      alpha: alpha,
+    );
+  }
+}
diff --git a/lib/src/tween/src/extensions/display_object.dart b/lib/src/tween/src/extensions/display_object.dart
index 8a6ad20..5e07ca2 100644
--- a/lib/src/tween/src/extensions/display_object.dart
+++ b/lib/src/tween/src/extensions/display_object.dart
@@ -31,7 +31,6 @@ extension GTweenDiplayObjectExt on DisplayObject {
     Object onCompleteParams,
     Function onUpdate,
     Object onUpdateParams,
-//      Map vars,
     bool runBackwards,
     bool immediateRender,
     Map startAt,
@@ -56,24 +55,24 @@ extension GTweenDiplayObjectExt on DisplayObject {
     };
 
     return GTween.to(
-        this,
-        duration,
-        targetValues,
-        GVars(
-          ease: ease,
-          delay: delay,
-          useFrames: useFrames,
-          overwrite: overwrite,
-          onStart: onStart,
-          onStartParams: onStartParams,
-          onComplete: onComplete,
-          onCompleteParams: onCompleteParams,
-          onUpdate: onUpdate,
-          onUpdateParams: onUpdateParams,
-//          vars: vars,
-          runBackwards: runBackwards,
-          immediateRender: immediateRender,
-          startAt: startAt,
-        ));
+      this,
+      duration,
+      targetValues,
+      GVars(
+        ease: ease,
+        delay: delay,
+        useFrames: useFrames,
+        overwrite: overwrite,
+        onStart: onStart,
+        onStartParams: onStartParams,
+        onComplete: onComplete,
+        onCompleteParams: onCompleteParams,
+        onUpdate: onUpdate,
+        onUpdateParams: onUpdateParams,
+        runBackwards: runBackwards,
+        immediateRender: immediateRender,
+        startAt: startAt,
+      ),
+    );
   }
 }
diff --git a/lib/src/tween/src/gtween.dart b/lib/src/tween/src/gtween.dart
index a306894..3c5c70e 100644
--- a/lib/src/tween/src/gtween.dart
+++ b/lib/src/tween/src/gtween.dart
@@ -6,11 +6,11 @@ class GVars {
   bool useFrames;
   int overwrite;
   Function onStart;
-  CallbackParams onStartParams;
+  CallBackParams onStartParams;
   Function onComplete;
-  CallbackParams onCompleteParams;
+  CallBackParams onCompleteParams;
   Function onUpdate;
-  CallbackParams onUpdateParams;
+  CallBackParams onUpdateParams;
   bool runBackwards;
   bool immediateRender;
 
@@ -19,26 +19,26 @@ class GVars {
   /// TODO: maybe in future use vars from this object.
 //  Map vars;
 
-  GVars(
-      {this.ease,
-      this.delay,
-      this.useFrames,
-      this.overwrite,
-      this.onStart,
-      this.onComplete,
-      this.onUpdate,
-      onStartParams,
-      onCompleteParams,
-      onUpdateParams,
-//      this.vars,
-      this.runBackwards,
-      this.immediateRender,
-      this.startAt}) {
+  GVars({
+    this.ease,
+    this.delay,
+    this.useFrames,
+    this.overwrite,
+    this.onStart,
+    this.onComplete,
+    this.onUpdate,
+    Object onStartParams,
+    Object onCompleteParams,
+    Object onUpdateParams,
+    this.runBackwards,
+    this.immediateRender,
+    this.startAt,
+  }) {
     /// For easy of use, you can send any Object to be parsed as function
     /// arguments...
-    this.onStartParams = CallbackParams.parse(onStartParams);
-    this.onCompleteParams = CallbackParams.parse(onCompleteParams);
-    this.onUpdateParams = CallbackParams.parse(onUpdateParams);
+    this.onStartParams = CallBackParams.parse(onStartParams);
+    this.onCompleteParams = CallBackParams.parse(onCompleteParams);
+    this.onUpdateParams = CallBackParams.parse(onUpdateParams);
   }
 
   void defaults() {
@@ -64,7 +64,7 @@ class GVars {
   }
 
   static const String selfTweenKey = '{self}';
-  void _setCallbackParams(GTween twn, CallbackParams params) {
+  void _setCallbackParams(GTween twn, CallBackParams params) {
     final named = params.named;
     final positional = params.positional;
     if (named != null) {
@@ -347,7 +347,7 @@ class GTween {
     }
   }
 
-  void _signal(Function callback, CallbackParams params) {
+  void _signal(Function callback, CallBackParams params) {
     if (callback != null) {
       /// It's a very slow approach.
       Function.apply(callback, params?.positional, params?.named);
@@ -453,7 +453,7 @@ class GTween {
       ..delay = delay
       ..useFrames = useFrames
       ..onComplete = callback
-      ..onCompleteParams = CallbackParams.parse(params);
+      ..onCompleteParams = CallBackParams.parse(params);
     return GTween(
       callback,
       0,
diff --git a/pubspec.lock b/pubspec.lock
index c87af4f..3712ec2 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -7,42 +7,42 @@ packages:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.5.0-nullsafety.3"
+    version: "2.4.2"
   boolean_selector:
     dependency: transitive
     description:
       name: boolean_selector
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.0-nullsafety.3"
+    version: "2.0.0"
   characters:
     dependency: transitive
     description:
       name: characters
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0-nullsafety.5"
+    version: "1.0.0"
   charcode:
     dependency: transitive
     description:
       name: charcode
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.0-nullsafety.3"
+    version: "1.1.3"
   clock:
     dependency: transitive
     description:
       name: clock
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0-nullsafety.3"
+    version: "1.0.1"
   collection:
     dependency: transitive
     description:
       name: collection
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.15.0-nullsafety.5"
+    version: "1.14.13"
   convert:
     dependency: transitive
     description:
@@ -63,7 +63,7 @@ packages:
       name: fake_async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.0-nullsafety.3"
+    version: "1.1.0"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -80,28 +80,28 @@ packages:
       name: matcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.12.10-nullsafety.3"
+    version: "0.12.8"
   meta:
     dependency: transitive
     description:
       name: meta
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.3.0-nullsafety.6"
+    version: "1.1.8"
   path:
     dependency: transitive
     description:
       name: path
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.8.0-nullsafety.3"
+    version: "1.7.0"
   pedantic:
     dependency: "direct dev"
     description:
       name: pedantic
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.9.2"
+    version: "1.9.0"
   petitparser:
     dependency: transitive
     description:
@@ -120,56 +120,56 @@ packages:
       name: source_span
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.8.0-nullsafety.4"
+    version: "1.7.0"
   stack_trace:
     dependency: transitive
     description:
       name: stack_trace
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.10.0-nullsafety.6"
+    version: "1.9.5"
   stream_channel:
     dependency: transitive
     description:
       name: stream_channel
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.0-nullsafety.3"
+    version: "2.0.0"
   string_scanner:
     dependency: transitive
     description:
       name: string_scanner
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0-nullsafety.3"
+    version: "1.0.5"
   term_glyph:
     dependency: transitive
     description:
       name: term_glyph
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.0-nullsafety.3"
+    version: "1.1.0"
   test_api:
     dependency: transitive
     description:
       name: test_api
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.2.19-nullsafety.6"
+    version: "0.2.17"
   typed_data:
     dependency: transitive
     description:
       name: typed_data
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.3.0-nullsafety.5"
+    version: "1.2.0"
   vector_math:
     dependency: "direct main"
     description:
       name: vector_math
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.0-nullsafety.5"
+    version: "2.0.8"
   xml:
     dependency: "direct main"
     description:
@@ -178,4 +178,4 @@ packages:
     source: hosted
     version: "4.5.1"
 sdks:
-  dart: ">=2.12.0-0.0 <3.0.0"
+  dart: ">=2.9.1 <3.0.0"
diff --git a/pubspec.yaml b/pubspec.yaml
index b0a0fed..b696bcd 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -14,7 +14,7 @@ dependencies:
 
 
 dev_dependencies:
-  pedantic: ^1.9.2
+  pedantic: ^1.9.0
   flutter_test:
     sdk: flutter
   effective_dart: ^1.0.0
\ No newline at end of file