my bad for dp, but for the zombies handling brick sizes, having it rely on the # of zombs present @ that obstacle could make things more exciting. alone, only a single zomb can handle up to a 2x2 (or w/e u c fit as to the limit) but if another joins- 4x4, and blah blah blah so on. individual bricks could have a built in heallth system too, but that would seem too complex