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First, there are multiple ways to "move" your actors. How to make your actor move backwards depends on which technique you use to move it. Unless your world is unbounded, your actors will automatically be prevented from moving past any edge of your world. So, if moving in any one of the four cardinal directions (horizontally or vertically), you actor will stop at any edge. Then, it location (x- or y-coordinate value) can be used as a condition to change directions.

Thank you so much for your assistance! Is there any way you know of to increase Java Heap Memory?

That depends on how you are creating the text "Game Over" or "You Win!". If using a GameOver world, add a method to it to receive the counter object and have that method change its image as needed and add it to the world. If using a GameOver actor, then have the current world do the necessary adjustments to the image of the counter and move it to a more central location in the world.

That would depend on how you store the question, answer and options in fields.

You need to put references to the images you are using for the parameter of the method. For example: <Code Omitted>

You cannot use 'getWorld()' alone because it returns a reference to a World object, not a Space object -- so the compiler does not know to look in the Space class for those methods unless you inform it that the returned object is indeed a Space object. This is does by casting its type: <Code Omitted>

Your reference to the GreenfootSound object is created inside the constructor of the class and is lost as soon as the constructor finishes executing. At that point, there is no way to refer to it, to do any actions on it (pause, stop, restart, or whatever -- the methods of the GreenfootSound class cannot be executed on that sound because there is no way to refer to it). Notice how line 5 above refers to the sound (by the 'backgroundMusic' variable whose reference is created at line 4, within the constructor. By moving line 4 outside the constructor, the reference will be maintained as long

OK now what happens is only the first row seems to be affected by the statement, the rest of the aliens don't go left they drop down after hitting the right wall.

No we should download that scenario to work with that.

thank your"ll its working fine @danpost @Super_Hippo @davmac lol sorry for the confusion before

Thanks so much this really helped me grasp it!

Thanks

The simplest way to do it would be to add this line after line 7: <Code Omitted>This will set the image every act cycle no matter if it is needed or not. To avoid that, you could look at the following code. It only changes the image if the change is needed.