Well, It gets harder to kill him on Higher Rounds, and MUCH harder with more people. I use the Sickle and go for Jug. Then After I get Jug, (By round 6 or 7 or so.) I make a crawler. Usually it takes a while (9-15 Minutes, it depends if I had a Death Machine Earlier on), but it gets the job done. And as for the Wunderwaffe, it's been my Favorite weapon since Shi-no-numa.