Sonic special zone orb problem

[Appo]

Hey, I'm currently working on the special zone for a game I'm making (it's like a sonic 3 special zone but with a top down view)the part that i need some help with is after you collect a sqare of orbs, those orbs turn to rings. I have it so when you go over a blue orb it turns red like in sonic 3. The red square in the screenshot shows the path i mean.



Any help would be greatly appreciated

[mojofltr]

Quick example:
http://mfa.aquadasoft.com/upload/1311744360-Sonic_Orb_Appo.mfa

There are likely much better and easier ways to do it, but this is the way I thought of on the spot. The example uses the ForEach object which can be found here:

http://www.clickteam.com/epicenter/ubbthreads.php?ubb=showflat&Number=186462

[xhedgehogx]

How I would personally do it is to have invisible markers where those orbs are, once all are hit/activated, would replace all those orbs in that specific area with rings.

[Appo]

Thank for that mojofltr that helped me out loads

@ xhedgehogx, I tried something similar to what you said but i didn't know how to stop the sensor destroying other orbs you were nowhere near