try changing the random variables to
floor(random(0,3)
the other option would be to just spawn anywhere on the map
Add a box sprite over earth to create your non-spawning zone
on object created, if overlapping no-spawn zone sprite, then teleport the sprite elsewhere
Ah. I see how you got confused here (as the diagram shows spawned objects that have already moved). I only want it spawning on the sides and then moving towards the center (which is working but as you can see half of each side has no spawn for some reason).