How do I apply actions only to an object instance?

[Daifo]

Basic premise:
I basically have objects running around from left to right on a platform. Where it faces(left or right) is dependent on the variable number I give it(either 1 or -1). More objects of the same type is spawned through a left-click

Problem:
The problem I’m having is that when a new instance of the object is created, the left/right variable applies to all objects in the scene meaning they all move in the same direction

How do I set up the scene so that when I create a new instance, that instance would have it’s own left or right variable assigned to it so it never really moves at the exact same way as all the other instances?

[MrMen]

When you create the object on LMB click, are you setting the left/right variable in the same action box or as a sub event of that condition? If not, then the variable change be applied to all objects, not just the newly created one.