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I take absolutely no credit for this glitch at all, I simply stumbled upon it whilst looking on Youtube. It took me a few tries to do it but it's a very effective glitch once you're able to do it. I suggest trying to get at least a Raygun and either the RPD or HAMR, also you can get the Jetgun out there so try to get that too. You do get hit on the odd occasion but that's only if you stand right in front of them so if you stand back a little you'll be fine. Also as long as the powerups drop right against the wall, you can jump to get them.