diff --git a/flixel/FlxGame.hx b/flixel/FlxGame.hx
index 19f48fd5cb..937b539cbd 100644
--- a/flixel/FlxGame.hx
+++ b/flixel/FlxGame.hx
@@ -223,8 +223,8 @@ class FlxGame extends Sprite
 	/**
 	 * Instantiate a new game object.
 	 * 
-	 * @param	GameSizeX		The width of your game in game pixels, not necessarily final display pixels (see Zoom).
-	 * @param	GameSizeY		The height of your game in game pixels, not necessarily final display pixels (see Zoom).
+	 * @param	GameSizeX		The width of your game in game pixels, not necessarily final display pixels (see Zoom). If it is not a positive number, HaxeFlixel will auto detect the width according to the current window.
+	 * @param	GameSizeY		The height of your game in game pixels, not necessarily final display pixels (see Zoom). If it is not a positive number, HaxeFlixel will auto detect the height according to the current window.
 	 * @param	InitialState	The class name of the state you want to create and switch to first (e.g. MenuState).
 	 * @param	Zoom			The default level of zoom for the game's cameras (e.g. 2 = all pixels are now drawn at 2x).  Default = 1.
 	 * @param	UpdateFramerate	How frequently the game should update (default is 60 times per second).
@@ -232,7 +232,7 @@ class FlxGame extends Sprite
 	 * @param	SkipSplash		Whether you want to skip the flixel splash screen with `FLX_NO_DEBUG`.
 	 * @param	StartFullscreen	Whether to start the game in fullscreen mode (desktop targets only), false by default
 	 */
-	public function new(GameSizeX:Int = 640, GameSizeY:Int = 480, ?InitialState:Class<FlxState>, Zoom:Float = 1, UpdateFramerate:Int = 60, DrawFramerate:Int = 60, SkipSplash:Bool = false, StartFullscreen:Bool = false)
+	public function new(GameSizeX:Int = 0, GameSizeY:Int = 0, ?InitialState:Class<FlxState>, Zoom:Float = 1, UpdateFramerate:Int = 60, DrawFramerate:Int = 60, SkipSplash:Bool = false, StartFullscreen:Bool = false)
 	{
 		super();
 		
@@ -243,6 +243,14 @@ class FlxGame extends Sprite
 		// Super high priority init stuff
 		_inputContainer = new Sprite();
 		
+		if (GameSizeX <= 0)
+		{
+			GameSizeX = Std.int(Lib.current.stage.stageWidth);
+		}
+		if (GameSizeY <= 0)
+		{
+			GameSizeY = Std.int(Lib.current.stage.stageHeight);
+		}
 		// Basic display and update setup stuff
 		FlxG.init(this, GameSizeX, GameSizeY, Zoom);
 		
diff --git a/flixel/math/FlxPoint.hx b/flixel/math/FlxPoint.hx
index 83143e66ea..2ee4414094 100644
--- a/flixel/math/FlxPoint.hx
+++ b/flixel/math/FlxPoint.hx
@@ -151,6 +151,19 @@ class FlxPoint implements IFlxPooled
 		return this;
 	}
 	
+	/**
+	 * Scale this point.
+	 * 
+	 * @param	k - scale coefficient
+	 * @return	scaled point
+	 */
+	public function scale(k:Float):FlxPoint
+	{
+		x *= k;
+		y *= k;
+		return this;
+	}
+	
 	/**
 	 * Helper function, just copies the values from the specified point.
 	 * 
diff --git a/flixel/math/FlxVector.hx b/flixel/math/FlxVector.hx
index 71921087ce..39e5163d9d 100644
--- a/flixel/math/FlxVector.hx
+++ b/flixel/math/FlxVector.hx
@@ -102,7 +102,7 @@ class FlxVector extends FlxPoint
 	 * @param	k - scale coefficient
 	 * @return	scaled vector
 	 */
-	public inline function scale(k:Float):FlxVector
+	public override function scale(k:Float):FlxVector
 	{
 		x *= k;
 		y *= k;