What is flixel?
A revolution in Flash game production. An amazing new way for man to interface with machine. The beginning of a new tomorrow. Never before has the world witnessed such a collection of AS3 files. We put it all in the new flixel 2. Groups to help organize game objects, quad trees for faster, more accurate collisions, a cleaner API, plus all the old flixel classics: animated sprites, tilemaps, and particle emitters. Most importantly, flixel is still completely free for personal or commercial use. What are you waiting for? It’s time to make games!
Let's Go!
Step 1: Get the Tools
Flixel is designed to work with a variety of cheap or free Flash development tools. FlashDevelop and Flex Builder are two of these tools. FlashDevelop only runs on Windows. If you use FlashDevelop, you're going to need to download Adobe's free Flash tool Flex 3 SDK v3.4. If this sounds crazy or intimidating, try this handy tutorial.

Step 2: Download flixel
All you need to do now is actually download flixel. Note for pros: the flixel source is hosted on github! Download flixel by clicking here.

Step 3: Make a Game!
Hello World is always a good place to start. Here are versions for Flex Builder, FlashDevelop, and MXMLC. You can also check out the official flixel wiki or join the flixel forums to both give and receive help and advice. Finally, these sample projects all have source code available:

               

Step 4: Share it
The best thing about maing a Flash game is that almost everyone with a computer can play it. Upload your finished game to SWFCabin so you can share it with the rest of the world!
Features
Display Hundreds of Objects at Once
Create Tilemaps from Text Files or Images
Generate and Emit Particles for Hot Effects
Play Positional, Streaming, Looping Sounds
Scroll Objects or Groups in Parallax
Text Display, Buttons and Mouse Cursors
Save Games, Math Utiltities and Collisions
Pure ActionScript 3 is Fun and Free!
Rad Games

Mode
by Adam Atomic

Kavern Keeper
by Jarník

G-Switch
by Vasco Freitas et al

Droplets
by Richard Davey + iLKke
Submit a 128x128 image + URL here.
Updates
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Hate flixel?
If you are allergic to flixel for one reason or another, don’t give up! Check out ChevyRay’s library FlashPunk instead, it’s awesome!
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stupid CSS background fix