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I'd like to know how do you make an actor appear randomly on an entire game?

On the create actor event put the following code:

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x = rand(200);
y = rand(200);

in this case, the actor will appear randomly between x 0 - 200 and y 0-200.

That code will only work for any actor arround x 0-200 and y 0-200, what if you want to put your actor at x,y(500,1500)???
Use this code to make its appear randomly at any coordinate

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x-=rand(400);
x+=rand(400);
y-=rand(400);
y+=rand(400);

x=rand(800)-400;

Go one step further, with a wireframe/filled region actor, script called from the wireframe/filled actor:

otheractorname.x=rand(width);

Many users don't realize, you can use the variables 'width' and 'height' for any actor. ( I don't think its mentioned in the documentation).

DST wrote:x=rand(800)-400;

Ah yes, thats what I mean...
you forgot something

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y=rand(800)-400;

using width just move that actor as far as it's own width...