penetrator can set em off, best to aim for the heads, and take out demos first even if walls are taking damage from normal z's, eliminate the chance of another zombie smacking the button themselves
buried treasures until night first 2 days, gathering small bits of supplies as I pass trash/cars, cut a tree around 3:30am every morning so its lights out around the time im done...by day 3 im finding a permanent home and potential hordebase