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thanks that works great

thank you so much, now it works!!

Basically, you need to differentiate between objects which scroll, objects which should be fixed on the screen (for example score displays) and the object which causes the scrolling. When you add an object to the world, you add it to a scrolling or non-scrolling list. Whenever the object which is causing the scrolling reaches a certain point on the x-axis, you move all objects in the scrolling-list (and the object itself) to the side. You could look at this scenario from danpost: http://www.greenfoot.org/scenarios/19020

Interesting, but I think it is something else than my question that is the problem. That is, I answered my own question, I think.

Thanks for the help! I'm new to this so I have no idea what I'm doing.

Please upload your code here to the site or post relevant code here in the discussion. To see if there is a wall next to you, locate where the ghost is in the world's array and check the "neighbors".

Use the 'Math.hypot' method (Pythagoras) to check the distances if you moved to the direction. So use the player's location and the current location of the enemy ± some x/y value depending on the direction you check.

Option 1: <Code Omitted> <Code Omitted> Option 2:

What is the size of a platform? An often used approach to do it is: - move - if it collided, move back to where it was It seems much easier than using all those variables.

Not sure if Google Translate works as it should, but I guess you should use the 'setPaintOrder' method. You can not place a specific object on top of everything else, but you can let all instances of a class be on top of all others.

If you draw a string on an image using the GreenfootImage constructor, it will use the default font. (You can't change the font before the image is created).

You use "children_boards", but "children_boards" is null. You never set it to anything.

I apparently mistook what you had in your original code. Reverse the order -- fill first, then draw the rectangle.

Maybe you can have a laser hold which unit it is touching and only deal damage when it does not currently hold the unit it is found to be touching (setting it to a unit when found touching and dealing damage so it does not deal multiple damage).