Hey, I need help with the Easter Egg challenge on moon for ps3. I don't have a mic but just tell me what to do and i'll do it. my psn is Sgguitarist

I'm looking to do the easter egg challenge on ps3. Farthest i've gotten on moon was 18, 2 player split screen. I didn't have internet at the time so it didn't save. But i'm not bad at all at zombies. ...