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You mention bullet hitting a P1 object, but I only see code for hitting a P2 object.

Change line 6 to: <Code Omitted>

Please provide the code in question (the more, the better).

Oke, thanks for your help

thank you very much

There are the isTouching(Class) and removeTouching(Class) methods.

In GameWorld class, line 17 declares a local variable called s1 which overshadows the instance field declared on line 3. Remove the declaring type on line 17 (the first word) so that the instance field gets assigned the object created.

thanks Dan!!!

Does not help. Invalid parameter; and ";" would be expected before "{".

Call the list items (with the "s" at the end). Declare it as <Code Omitted>Remove the collision code from the item class and put it in the player class: <Code Omitted>Then, you can just use, <Code Omitted>where the list is not empty and n is between 0, inclusive and the size of the list, exclusive; plus x and y are

I am sorry to say that at the moment, I do not have any demos on controlling a car. That would be something to consider. At any rate, your smoothness is not that great. At slow speed, only few angles of movement will be achieved. Also, the turn rate should be governed by the speed -- not just to turn or not turn, but how much turn allowed dependent on speed (no speed means no turn; slow speeds would be close to maximum turn -- minimum radius turn

If you have multiple check boxes where only one is to be checked at a time, put group in an array:

Thank You!

Currently, you have no way to control the music at all because you are using Greenfoot.playSound which does not give you a reference to any GreenfootSound object. Instead, create a GreenfootSound object and retain it in a class field so you can access it from anywhere in your project. You can then stop the sound when changing world (either before, during or after creating the new world).