I just unlocked the “Its a trap” trophy in Map Pack 2.
I threw a couple of grenades in the middle of round 8 or somewhere near, and at least 3 zombies must be crawlers. You will need to open up 3 doors. And then manage to keep quite a distance between the crawlers. Lure each crawler to the electric shield in the 3 doors.The best doors to open would be the all the doors except the “Comm Room”. Make sure you have at least 8,250 points(1000 for each door, 750 for each hut, 1000 for each trap). You could also use the big catapult thingy as a trap instead of an electric shield, but make sure that none of the trapsare repeated, AND it must be in the same round.
