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Yeah that looks like what I'm looking for. Thanks henrYoda :) Also though, what's the most effective way of creating a random selection of questions without having long and strenuous code?

ok

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You could also cache the images by declaring them static, that way they all share the same image: private static GreenfootImage image1 = new GreenfootImage("space.jpg");

If all changes in the score are multiples of ten, then you could change the 'act' method to the following: <Code Omitted>

Thank you very much. Would you happen to know how to play a sound file when the game ends or include pop ups in the game?

Well a I already know abstracts work, LightActor and UseableActor are abstract. I wished interfaces would work. I don't want an empty abstract class that any HUD items need to extend, especially since a couple of the HUD implemented classes extend other objects...

A Grenade actor would need several things, a time limit to detonation, a blast radius, and affecting specific actors around it are the three biggest things that come to my mind. A detonation is easy if you know how to create counters that count down or up to the time. The blast radius and affecting other actors is a little bit harder. You need to use getObjectsInRange() to find actors around the grenade, and then affect them accordingly. Here's an example of how to use getObjectsInRange():

Sry i have only my ipad now and not the computer, but i have no error. I removed the && reload.getWorld() == null in your code and now it works, and at this time i cant see any laggs. Thank you

I think your ghostAi method is the problem. Try using this method:

Ok, so read the tutorial linked above and ask specific questions if you need more help.

That doesn't make sense. You need at least two images for animation - one with the mouth open and one with it shut. If you have only two images and you want to slow the animation, you have two choices: move less often, or do not animate every time you move. (You'll never get it to look like the original pacman this way; you need more images).

may u have the example of scenario from the typing game???

The 'setColor' method just changes the color that will be used to draw on the image with the drawing methods; it doesn't change the color of the image. You need to draw on the image after setting the color.