FlxBitmapFont This is a text display class which uses bitmap fonts.
 FlxButton A simple button class that calls a function when clicked by the mouse.
 FlxG This is a global helper class full of useful functions for audio, input, basic info, and the camera system among other things.
 FlxGame FlxGame is the heart of all flixel games, and contains a bunch of basic game loops and things.
 FlxGroup This is an organizational class that can update and render a bunch of FlxObjects.
 FlxMonitor FlxMonitor is a simple class that aggregates and averages data.
 FlxObject This is the base class for most of the display objects It includes some basic attributes about game objects, including retro-style flickering, basic state information, sizes, scrolling, and basic physics and motion.
 FlxPoint Stores a 2D floating point coordinate.
 FlxQuadTree A fairly generic quad tree structure for rapid overlap checks.
 FlxRect Stores a rectangle.
 FlxSave A class to help automate and simplify save game functionality.
 FlxSound This is the universal flixel sound object, used for streaming, music, and sound effects.
 FlxSprite The main "game object" class, handles basic physics and animation.
 FlxState This is the basic game "state" object - e.g.
 FlxText Extends FlxSprite to support rendering text.