It's not a cheat or a hack, you jump on the wall at the back. You have to know the exact process and takes some practice (or you can get a teammate to give you a boost), but in my opinion it's not worth it. After you do it a couple times it gets really boring and it's not as good as a spot and most people think.. I've picked off dozens of people up there (not all at the same time, hehe)
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www.sympc.com/wtf