Press the guide button then got to "Marketplace" and press "Redeem Code" type it in and press start. Done
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Why yes they can if the game glitches somehow... Or they use there MLG LEGITZZZ Powers to use them.
if you mean online credits in reach, it means the credits you can use for buying spartan armor parts to customize your look. you do not gain or use real money in the games.
You put in your Halo 3:ODST campaign disk and go to play the BETA and download it.
A Spartan or Elite can do this. All you need is to have the Evade armor ability. Once you have this, just push the button that allows you to use it. I believe its the right bumper. I wouldn't know, because I use Bumper Jumper. Just like that, you can roll!
No. You have to use your Xbox 360 I think.