I play solo on this map and was at round 57 with over 17 slow crawlers and left them over by the AK-74u part of map, went to beginning of map and shot the rock and i only keep getting 8-9 at a time, what else should I do???
Best way I'd recommend is getting a friend to run trains outside the lighthouse and you walk up to the power and shoot one from there. Try to get the bullet to actually stick to one of the zombies in the middle to take out the most. If you playing solo, just try to get a bunch of crawlers out there and run up to the power room fast then shoot from there. Maybe easier just to get a friend though to run trains.