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ok now i got it. the class I wanted to remove (RasenmaeherR) was a subtype of Rasterobjekte (i just needed these one to try out the positions). I changed that and now is everything ok. thanks a lot greetings seelensauger

would anyone be able to help me on this?

Fixed it already thanks:) With Greenfoot.setWord(newFloodWorld(Menu.DijkDoorBraak.charselect) give a parameter. in FloodWorld. Public FloodWorld(int charselect)

thank you, it worked!

Change the calling method to the following: <Code Omitted>

yes I was, Thanks guys.

Shrug indeed...

You are probably calling the 'redCheck' method either before the Cursor object is placed in the world or after it has been removed. You could put a check as the first statement in the 'redCheck' method to avoid the error: <Code Omitted>

https://www.dropbox.com/s/kjmmnb4yreezj00/Dijkdoorbraak.rar sorry for the Dropbox link. but i dont know how to share the code

You need to declare an instance int field in the class to hold the speed for each object created and assign the random value (1, 2, 10, or 20) in the constructor of the object. <Code Omitted> if radNum=0: radNum/2=0, *9=0, +1=1; radNum%2=0, +1=1; 1*1=1 if radNum=1: radNum/2=0, *9=0, +1=1; radNum%2=1, +1=2; 1*2=2 if radNum=2: radNum/2=1, *9=9, +1=10; radNum%2=0, +1=1; 10*1=10 if

3D rendering is very difficult. There are actually many different ways to render 3D objects, but for all of them the algorithms are quite complex. If you're wanting to do 3D, Greenfoot isn't really a realistic option. You could try JMonkeyEngine (that was what I used when I first did 3D). If you're wanting to create a 3D rendering engine (I wouldn't personally recommend it, but it's up to you), then Google should help you out with what the algorithms actually are

Thanks

<Code Omitted> that's how I made it in my first game i hope this is what u asked for