Ho Ho Ho! Keep an eye out for emails this Christmas Eve, because if you so choose to enter, RNGesus might send you a present!
What better game to share with one's family than a first person shooter with tons of bad guys, up to four player split-screen multiplayer and up to sixteen player co-op? What, don't play video games with your family? Me either. At least the singleplayer is pretty good... not as good as the first or second encounter, but still pretty good.
Also, remember to change the colors to "vibrant."