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Since Der Riese, the barriers I knew about were patched. And due to a long story, I need to re-earn the Big Baller (75,000 points) and Deadhead (150 headshots) trophies. The problem is, I only earned them by using the barrier in the main room. And since that doesn't work, I don't know how to get them.
So are there any zombie barriers that still work? I know the dog glitch and multiple gun still work, but I really need something to keep me safe from zombies. And if not, any good strategies that will keep me lasting that long?