this is using an edditted code from mover which is as follows:

I have not done too much with working with different worlds, but I do know the use of '==' is not a good idea with worlds. Use the 'isInstanceOf(Object object)' method instead.. I think I have them in the correct order.

Are Greece1 and Greece2 world classes, or world objects? Do you get a compiler error - if so, on which line, and what does it say? Danpost: I'm dubious of the code you posted. Perhaps you meant: This assumes that Greece1 is a class, of course. You could just as well do:

with this it says "cannot find symbol - class Greece2. It definitely exists and is a seperate world. and for this it says the in cannot find the variable Greece1

This *should* work. I haven't tested it, just coded it into the reply box.

But is it a class, or a reference? The Greenfoot.setWorld() method requires a world instance as a parameter. Try replacing: Greenfoot.setWorld(Greece2); with: Greenfoot.setWorld(new Greece2()); (Although, the error message doesn't really make sense - are you sure that's what it says with the code you posted?)

OK, I think it's all working now except the part. That's my problem.

Or mine, from 2 days ago? if (Greece1.class.isInstance(getWorld()))

Fair enough - I'm just going to leave this thread alone now: he's got multiple answers, he just needs to see that they're there

That's my code, and it compiles, but it doesn't work. If I go to the edge of the world I don't switch worlds :( Just FYI I also have the World code that Duta posted earlier