Each day a new challenge will appear, which you can learn simply by being signed into Xbox Live and scrolling down to the Challenge portion of the menu. Complete the challenge and you’ll get “a significant number of credits.”
There may be some crazy conditions that need to be met, including playing on specific levels with specific skulls turned on. Just setting up a game could be a chore — or at least it could be if Bungie wasn’t doing all of the work for you. When you scroll to a specific challenge, all you have to do is hit the A Button to accept it. From there, the game will automatically set up a lobby with all of the specific conditions needed to meet the challenge already set up for you.
That sounds like Bungie’s made participating in the Challenge arena a no-brainer for most people! (Louis Wu 13:58:06 UTC)