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That means that you have not set a Counter object to the 'scoreCounter' class field.

Here is what I see: we have an Actor class that creates Rat objects (line 9) that initially moves 1 pixel per act (line 11). The fact that the 'speed' field has 'private' access and that the value of the field is never changed indicates that this initial speed is also its permanent speed when moving. This makes the 'for' loop in the 'act' method (line 18) unnecessary. The following should be sufficient: <Code Omitted>Now, for the 'move' method: lines 22 through 26 gets user keyboard input for movement of the actor by way of the arrow keys -- no problem

Thanks for the reply davmac :) As for other programs claiming the gamepad, I'm not sure about that, I'm not playing any other games with the gamepad plugged in at the time... There may be some hidden prog

I tried with new scenario and scenarios from the Website Always the Same problem

where is scenario ?

Thanks JetLennit and danpost! You guys helped a lot!

It would help if you show what you have tried (use the 'code' link below the reply box for posting code). The code for the pieces might be important; how many pieces created (or moving) might help; any extra information regarding what you are trying to accomplish (in general) might also help.

If you want to keep score during the game, I have made a downloadable ScoreBoard class that you might find useful. You can find the class here: http://mrstewartslessons.com/useful_class_scoreboard.html Simply download the class into your Greenfoot project folder. Close Greenfoot and open it again and you'll see the ScoreBoard class among your actors. Open its code window and change 'Source Code' to 'Documentation' and you'll see directions as to how to use it in your actor's code. It has various constructors that allow

I have made a MoveRandomly class that you can include in your Greenfoot project that will cause another actor to move randomly. The code can be found here: http://mrstewartslessons.com/useful_class_moverandomly.html Simply download the java file into your greenfoot project. Close greenfoot and reopen the project, and you'll see the MoveRandomly class among your actors. Open the code window and change 'Source Code' to 'Documentation' and you'll see directions for including the object and its methods in your actor's co

I've created some useful classes that will do some of what you're looking for. Two of them in particular. The MoveRandomly class can be found here: http://mrstewartslessons.com/useful_class_moverandomly.html and the Projectile class can be found here: http://mrstewartslessons.com/useful_class_projectile.html To use them, download the files into your Greenfoot project's folder. Close the project and open it again and you'll see the classes list

<Code Omitted>The above line can be used in your Crab class to obtain a reference to the counter. After that line you can call any public method on 'counter' ( counter.methodName(parameters); ).

You might want to use the DriftMove class which I have created. It allows you to make an object drift on the screen and features a BounceAtEdge method that reflects at the angle that it hits the edge, just like a regular ball. It also allows you to set a random speed on spawning, and a number of other methods that might help. You can find it here: http://mrstewartslessons.com/useful_class_driftmove.html Select-click on the 'Download Class' and save it in your project folder. Close your project and open it again, and th