Right now you can "Like" Walmart's GameCenter on Facebook to enter to win their Ultimate T-Mobile/Halo 4 prize package.
Here's what you'll be entered to win:
- a Halo 4 themed Xbox 360
- a copy of Halo 4
- a T-Mobile Smartphone
- and a trip to Los Angeles, plus $1,000 in spending money!
Sweepstakes ends 12/31.