I think this is the same kind of problem I have. Lets say me and my opponent are shooting lots missiles at each other. All my missiles have Alterable value=1, and my opponent missiles have Alterable value=2, but they are the same kind of missile. I want an event that says if 2 missiles collide and they have different alterable values, they explode, but if its the same(ie both belonging to the same player) they don't. Putting in an event that says, "If a missile overlaps a missile + if a missile has value 1 + if a missile has value 2, create explosion and destroy missile" just does not work. I can't think of a way of doing this without either continuously creating invisible objects each frame for every projectile, or by having 2 instances of every weapon(which is a pain in the butt if you want to balance things later on, and which I fear because it might build subtle imbalances between the players(event order and human error etc))

How do I write an event to do this, keeping in mind I am using GF2 not MMF.