diff --git a/src/core/Group.js b/src/core/Group.js
index b4f4dca72..74bb21dcf 100644
--- a/src/core/Group.js
+++ b/src/core/Group.js
@@ -7,10 +7,10 @@
 /**
 * Phaser Group constructor.
 * @class Phaser.Group
-* @classdesc A Group is a container for display objects that allows for fast pooling, recycling and collision checks.
+* @classdesc A Group is a container for display objects that allows for fast pooling and object recycling. Groups can be nested within other Groups and have their own local transforms.
 * @constructor
 * @param {Phaser.Game} game - A reference to the currently running game.
-* @param {*} parent - The parent Group, DisplayObject or DisplayObjectContainer that this Group will be added to. If undefined or null it will use game.world.
+* @param {Phaser.Group|Phaser.Sprite} parent - The parent Group, DisplayObject or DisplayObjectContainer that this Group will be added to. If undefined or null it will use game.world.
 * @param {string} [name=group] - A name for this Group. Not used internally but useful for debugging.
 * @param {boolean} [addToStage=false] - If set to true this Group will be added directly to the Game.Stage instead of Game.World.
 */
@@ -708,12 +708,9 @@ Phaser.Group.prototype.callAll = function (method, context) {
 */
 Phaser.Group.prototype.preUpdate = function () {
 
-    for (var i = 0, len = this.children.length; i < len; i++)
+    for (var i = this.children.length - 1; i >= 0; i--)
     {
-        if (this.children[i]['preUpdate'])
-        {
-            this.children[i].preUpdate();
-        }
+        this.children[i].preUpdate();
     }
 
 }
@@ -725,12 +722,9 @@ Phaser.Group.prototype.preUpdate = function () {
 */
 Phaser.Group.prototype.update = function () {
 
-    for (var i = 0, len = this.children.length; i < len; i++)
+    for (var i = this.children.length - 1; i >= 0; i--)
     {
-        if (this.children[i]['update'])
-        {
-            this.children[i].update();
-        }
+        this.children[i].update();
     }
 
 }
@@ -742,12 +736,9 @@ Phaser.Group.prototype.update = function () {
 */
 Phaser.Group.prototype.postUpdate = function () {
 
-    for (var i = 0, len = this.children.length; i < len; i++)
+    for (var i = this.children.length - 1; i >= 0; i--)
     {
-        if (this.children[i]['postUpdate'])
-        {
-            this.children[i].postUpdate();
-        }
+        this.children[i].postUpdate();
     }
 
 }
diff --git a/src/core/World.js b/src/core/World.js
index a550b1dfe..4647d11cb 100644
--- a/src/core/World.js
+++ b/src/core/World.js
@@ -39,7 +39,7 @@ Phaser.World = function (game) {
     */
     this.currentRenderOrderID = 0;
     
-};
+}
 
 Phaser.World.prototype = Object.create(Phaser.Group.prototype);
 Phaser.World.prototype.constructor = Phaser.World;
@@ -72,12 +72,9 @@ Phaser.World.prototype.preUpdate = function () {
     
     this.currentRenderOrderID = 0;
 
-    for (var i = 0, len = this.children.length; i < len; i++)
+    for (var i = this.children.length - 1; i >= 0; i--)
     {
-        if (this.children[i]['preUpdate'])
-        {
-            this.children[i].preUpdate();
-        }
+        this.children[i].preUpdate();
     }
 
 }
@@ -90,12 +87,9 @@ Phaser.World.prototype.preUpdate = function () {
 */
 Phaser.World.prototype.update = function () {
 
-    for (var i = 0, len = this.children.length; i < len; i++)
+    for (var i = this.children.length - 1; i >= 0; i--)
     {
-        if (this.children[i]['update'])
-        {
-            this.children[i].update();
-        }
+        this.children[i].update();
     }
 
 }
@@ -116,24 +110,18 @@ Phaser.World.prototype.postUpdate = function () {
 
         this.camera.update();
 
-        for (var i = 0, len = this.children.length; i < len; i++)
+        for (var i = this.children.length - 1; i >= 0; i--)
         {
-            if (this.children[i]['postUpdate'])
-            {
-                this.children[i].postUpdate();
-            }
+            this.children[i].postUpdate();
         }
     }
     else
     {
         this.camera.update();
 
-        for (var i = 0, len = this.children.length; i < len; i++)
+        for (var i = this.children.length - 1; i >= 0; i--)
         {
-            if (this.children[i]['postUpdate'])
-            {
-                this.children[i].postUpdate();
-            }
+            this.children[i].postUpdate();
         }
     }
 
diff --git a/src/gameobjects/Image.js b/src/gameobjects/Image.js
index a56907540..d53cc3df3 100644
--- a/src/gameobjects/Image.js
+++ b/src/gameobjects/Image.js
@@ -147,7 +147,17 @@ Phaser.Image.prototype.preUpdate = function() {
 
     return true;
 
-};
+}
+
+/**
+* Override and use this function in your own custom objects to handle any update requirements you may have.
+*
+* @method Phaser.Image#update
+* @memberof Phaser.Image
+*/
+Phaser.Image.prototype.update = function() {
+
+}
 
 /**
 * Internal function called by the World postUpdate cycle.
@@ -168,7 +178,7 @@ Phaser.Image.prototype.postUpdate = function() {
         this.position.y = this.game.camera.view.y + this.y;
     }
 
-};
+}
 
 /**
 * Changes the Texture the Sprite is using entirely. The old texture is removed and the new one is referenced or fetched from the Cache.
@@ -245,7 +255,7 @@ Phaser.Image.prototype.loadTexture = function (key, frame) {
         }
     }
 
-};
+}
 
 /**
 * Crop allows you to crop the texture used to display this Image.
@@ -292,7 +302,7 @@ Phaser.Image.prototype.crop = function(rect) {
         }
     }
 
-};
+}
 
 /**
 * Brings a 'dead' Sprite back to life, optionally giving it the health value specified.
@@ -316,7 +326,7 @@ Phaser.Image.prototype.revive = function() {
 
     return this;
 
-};
+}
 
 /**
 * Kills a Sprite. A killed Sprite has its alive, exists and visible properties all set to false.
@@ -341,7 +351,7 @@ Phaser.Image.prototype.kill = function() {
 
     return this;
 
-};
+}
 
 /**
 * Destroys the Sprite. This removes it from its parent group, destroys the input, event and animation handlers if present
@@ -378,7 +388,7 @@ Phaser.Image.prototype.destroy = function() {
 
     this.game = null;
 
-};
+}
 
 /**
 * Resets the Sprite. This places the Sprite at the given x/y world coordinates and then sets alive, exists, visible and renderable all to true.
@@ -401,7 +411,7 @@ Phaser.Image.prototype.reset = function(x, y) {
 
     return this;
     
-};
+}
 
 /**
 * Brings the Sprite to the top of the display list it is a child of. Sprites that are members of a Phaser.Group are only
@@ -427,7 +437,7 @@ Phaser.Image.prototype.bringToTop = function(child) {
 
     return this;
 
-};
+}
 
 /**
 * Indicates the rotation of the Sprite, in degrees, from its original orientation. Values from 0 to 180 represent clockwise rotation; values from 0 to -180 represent counterclockwise rotation.
diff --git a/src/gameobjects/Sprite.js b/src/gameobjects/Sprite.js
index e329aadb4..b13634a1c 100644
--- a/src/gameobjects/Sprite.js
+++ b/src/gameobjects/Sprite.js
@@ -153,10 +153,10 @@ Phaser.Sprite = function (game, x, y, key, frame) {
     * 4 = fresh? (0 = no, 1 = yes)
     * 5 = outOfBoundsFired (0 = no, 1 = yes)
     * 6 = exists (0 = no, 1 = yes)
-    * @property {array} _cache
+    * @property {Int16Array} _cache
     * @private
     */
-    this._cache = [0, 0, 0, 0, 1, 0, 1];
+    this._cache = new Int16Array([0, 0, 0, 0, 1, 0, 1]);
 
     /**
     * @property {Phaser.Rectangle} _bounds - Internal cache var.
@@ -272,6 +272,16 @@ Phaser.Sprite.prototype.preUpdate = function() {
 
 };
 
+/**
+* Override and use this function in your own custom objects to handle any update requirements you may have.
+*
+* @method Phaser.Sprite#update
+* @memberof Phaser.Sprite
+*/
+Phaser.Sprite.prototype.update = function() {
+
+};
+
 /**
 * Internal function called by the World postUpdate cycle.
 *
diff --git a/src/gameobjects/Text.js b/src/gameobjects/Text.js
index ad1b69280..b89281fab 100644
--- a/src/gameobjects/Text.js
+++ b/src/gameobjects/Text.js
@@ -121,6 +121,16 @@ Phaser.Text.prototype.preUpdate = function () {
 
 }
 
+/**
+* Override and use this function in your own custom objects to handle any update requirements you may have.
+*
+* @method Phaser.Text#update
+* @memberof Phaser.Text
+*/
+Phaser.Text.prototype.update = function() {
+
+}
+
 /**
 * Automatically called by World.postUpdate.
 * @method Phaser.Text.prototype.postUpdate
@@ -219,7 +229,7 @@ Phaser.Text.prototype.setStyle = function (style) {
     this.style = style;
     this.dirty = true;
 
-};
+}
 
 /**
 * Renders text. This replaces the Pixi.Text.updateText function as we need a few extra bits in here.
@@ -299,7 +309,7 @@ Phaser.Text.prototype.updateText = function () {
     }
 
     this.updateTexture();
-};
+}
 
 /**
 * Greedy wrapping algorithm that will wrap words as the line grows longer than its horizontal bounds.
@@ -347,7 +357,7 @@ Phaser.Text.prototype.runWordWrap = function (text) {
 
     return result;
 
-};
+}
 
 /**
 * Indicates the rotation of the Text, in degrees, from its original orientation. Values from 0 to 180 represent clockwise rotation; values from 0 to -180 represent counterclockwise rotation.
diff --git a/src/gameobjects/TileSprite.js b/src/gameobjects/TileSprite.js
index 0738d8076..644047d26 100644
--- a/src/gameobjects/TileSprite.js
+++ b/src/gameobjects/TileSprite.js
@@ -119,6 +119,16 @@ Phaser.TileSprite.prototype.preUpdate = function() {
 
 }
 
+/**
+* Override and use this function in your own custom objects to handle any update requirements you may have.
+*
+* @method Phaser.TileSprite#update
+* @memberof Phaser.TileSprite
+*/
+Phaser.TileSprite.prototype.update = function() {
+
+}
+
 /**
 * Internal function called by the World postUpdate cycle.
 *
@@ -232,7 +242,7 @@ Phaser.TileSprite.prototype.loadTexture = function (key, frame) {
         }
     }
 
-};
+}
 
 /**
 * Destroys the TileSprite. This removes it from its parent group, destroys the event and animation handlers if present
@@ -262,7 +272,7 @@ Phaser.TileSprite.prototype.destroy = function() {
 
     this.game = null;
 
-};
+}
 
 /**
 * Play an animation based on the given key. The animation should previously have been added via sprite.animations.add()
@@ -280,7 +290,7 @@ Phaser.TileSprite.prototype.play = function (name, frameRate, loop, killOnComple
 
     return this.animations.play(name, frameRate, loop, killOnComplete);
 
-};
+}
 
 /**
 * Indicates the rotation of the Sprite, in degrees, from its original orientation. Values from 0 to 180 represent clockwise rotation; values from 0 to -180 represent counterclockwise rotation.