For the level 5 Engineering the easiest way is to knock out the first 2 spawn areas and build up forces. Carve out above the wall of creeper and hollow out the middleish space, put a teleport portal there and put 4 or 5 blasters and a couple rockets to peck at it. Build several anticreepers on charge and scoop up on the ore in map. When you have 5 or so anticreepers filled move them above the "wall". Make sure to have the area shielded off so the anticreeper concentrates on the wall and put a row of unarmed blasters filling up the rest of the space available. When everything is in place arm the blasters, put the anti's on produce and dump their contents. The wall wil crumble quickly then.
 "Creeper World 2: Academy"){kind=icon}