2D game engine for iOS

I am searching for a 2D game engine for iPhone and iPad. Who has a experience in this field?

What is the engine runn开发者_开发问答ing Angry Birds?

I'd recommend Cocos 2D. However, you could use Unity for 2D games if you wanted, though it is designed with 3D games in mind. If you are more of a hobbyist, iTorque 2D is fun to play with.

Also, I believe that Angry Birds was built using the Box 2D physics engine but has a custom game engine written by good people over at Rovio.

If you know C++ then try Oxygine.

I recommend the emo framework: http://code.google.com/p/emo-framework/ It's not widely known yet, but it's a really powerful, wonderful, really beautiful framework. It's free and works on iOS and Android.

As far as Rovio and Angry Birds is concerned I also believe they use their own game engine, which uses Box2D as the physics engine http://box2d.org - this is a known fact, they were listed as Box2D users on Box2D website in the past, although I cannot find it right now. Box2D is used by many engines, including emo framework.