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Okay, first thing that needs done is to add variables to hold what movement was done. The character can move either way horizontally and vertically. So, a variable for change along the x-axis and a variable for change along the y-axis are needed. Your act method will now look like this: <Code Omitted>Now, that dx and dy are there,

Reason for the error: The actor is removed from the world and then you are calling a method which requires the actor to be in the world (in this case 'isTouching'). When the actor is removed from the world, the current act method will be finished. I don't really know why you need this code at all. You earlier check for the intersection with the Alien. If you want it to be removed, then remove it there. The 'toRemove' variable also seems to be useless.

Thank you very much. This is working very well now.

My map should have been this (forgot all the commas)... <Code Omitted> It's up to you if you prefer numbers or letters, it should do the same.

Ah, Thanks! Makes sense... don't know why I didn't think of that. Will try in a few minutes...

Are you trying to have two Greenfoot users play against each other on the website? Maybe this scenario will help you.

Count act cycles. Usually 300 act cycles is about 5 seconds. You can simply what you show above to this: <Code Omitted>

That fixed it. Thank you!

You need to upload the image to an image hosting site or somewhere on the web to be accessible here. Better would be for you to explain what issues you are having and posting the relevant code directly here, however.

You could try out my new ScoreControl class; however, it looks like that would take a lot of work to change the class over. On the other hand, it is quite a hassle passing the value from world to world. The way my new class works, is that the control is static and holds one counter value. It also creates an actor to display the value if needed. The class is located in my Combo Support Class Demo scenario; but, I will show a more generic version of it here (to use GreenfootImage objects instead of TextImage objects):

All you need is one long type field and one int counter. The counter is incremented every 10 minutes and the other is to hold the time when the counter is to be incremented next:

Ok, thanks