Hi, I’m from Croatia…I don’t know a lot about unity3d engine, but i study informatics and i have a seminar on the topic: unity3d game engine…so, I wonder if someone could tell me, why unity3d is so special? i’m sorry but my english is not very good…

First of let me say this will not be very accurate as i have only used a few game engines.
I like it because its simple and has a nice easy layout, and there are alot of assets you can get which is helpful for game development.