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Thank you very much!!!

Thanks Dan.

Thank you for your help but I have worked it out now, I accidentally had an infinite loop spawning a GUI in the same place so I couldn't tell it was spawning more than once but was causing loads of lag.

Keep in mind that actors leaving the viewable world which are no longer needed should be removed from the world to prevent possible lag.

Line 1 is a field declaration line -- a variable that is declared within a class, but not within a method or constructor (which are just plain variables). Each object created from the class comes with a placeholder for, in this case, an 'int' value called 'rotation' given an initial value of '0'. As 'private', no other class has direct access to the field. The field will exist as long as the object it belongs to exists. A field can be of any of the primary types (int, double, float, boolean, etc.) or it can reference an object of the s

The newer versions of greenfoot have the 'setColor' and 'setFont' methods using parameters of type 'greenfoot.Color' and 'greenfoot.Font'. Remove the import lines 3 and 4 and replace 'Font.PLAIN' on line 14 with 'false, false' to conform to the 'greenfoot.Font' constructor.

Thankyou @Super_Hippo, that makes perfect sense.

Thank you!

When I run the scenario, both tanks kill themselves when shooting, so I don't know why you said the tanks acted differently. With touching I mean something like: <Code Omitted>

I do not see where 'conn' is being set any object to it (its value remains 'null', which you cannot execute any method on -- hence the error).

Thanks for all the help....I got it to work after switching some of my world class around and incorporating the code you provided.

hey danpost I have since fixed that problems already but thanks all the same

Ah I see. Thanks a lot, dan and hippo.

Please show what you tried (show the code for the CrabWorld class with what you attempted that failed).

thanks a bunch