To get creative you got to get rid of all that is understood without it being written. So first write the problem more precise and then make alterations.
So begin by rewriting the assignment to an easier version.
So the question rewritten becomes. How many matches does it take to create 30 separable squares?
Separable here ?meaning that is should exist on its own and in a group.
So varying this extra word. Does it exist something that is half separable. Like life can exist in space only it takes with it a smaller life support system. So there exist objects that exist and is working (alive) only it has access to another set of objects.