Whenever you had to do a challenge in reach like get 200 kills in any game type you could just go to campaign kill things stopped at 199 save and quit. Come back in game get your last kill and as soon as you did it'll give you your 5000 credits for completing the challenge. As soon as you complete it you pull out your Ethernet cable and sign back into Xbox live and you just redo it again. Unlimited credits.
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Huh. Wouldn't that only give people aesthetic options though? Not really an advantage, in fact some could say a disadvantage if they don't like the other armor permutations right?
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Well no because in halo the credits also worked as your xP in game.