The challenge is to beat a campaign level on Legendary difficulty in under 12 minutes not counting Lone Wolf. I was able to do this by getting to one of the last checkpoints before a level ends, then saving and quitiing, and quitting the game. I then started the game again, resumed my saved game, and quickly finished the level and the challenged popped. Using this strategy, it is an extremely easy 10000 credits.
Tip on Weekly Challenge 7/26/11
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