game-editor.com

with variables
actor2 - Collision(actor1) - Script Editor - [variable1]=1;
actor3 - Collision(actor1) - Script Editor - [variable2]=1;
actor2 - Collision Finish(actor1)- Script Editor - [variable1]0;
actor3 - Collision Finish(actor1) - Script Editor - [variable2]0;

actor1 - draw actor - script editor
if ([variable1]==1 && [variable2]==1)
{
//destroy actor
}

If you want to do it with three of the same actor, this method will work. It uses getAllActorsInCollision. If you want any of it explained, ask, but for now it's all in here. The collision event of course is the important one.

I helped you too......