Well I don't know if you're gonna get much help from my source since it's very confusing looking through the code. But I will upload the source for this version only then.

I think it will take some time, because first I want to make sure the level system is complete so people don't become max level in no time, because I didn't think it through. Also I would like to create a non-random world with goals so peoples location and progress is saved as well. I know there is no point in playing the game right now since there is no goal and your progress isn't saved. I am working hard on it, but it might take some time. Btw thanks SPower!

@MatheMagician The world is initialized with a random map of 100 x 100 blocks. The information is then kept in a 3D array, so that no matter how far you go the map will look the same when you come back. If you want to know more you could start a thread and I will put some of my code up there.

That depends on what you're going to use it for. Btw I think the code is a little messed up (it works but it might be a little hard to read for others).