I can say that it's not that easy. There is a lot programming that goes into doing a lot of this. I have made a few games in Unity, and other web applications. There are a lot of great features in Unity, but it is very bare bones when it comes to features. Examine UDK vs Unity and you'll see a huge difference. And when your talking about a Physics based game it gets even more complicated!
midwinterdreams
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