We're not going to say that the two games released on Xbox Live Arcade this week -- this week being Christmas -- were released as afterthoughts. However, they probably aren't games you've been dying to play. You can choose between block-pushing puzzle goodness or alien-blasting action in Polar Panic or 0 day Attack on Earth, respectively. Polar Panic will set you back 800 ($10), while 0 day Attack on Earth expects 1200 of your hard earned points ($15). Watch the latest XBLA in Brief and see if either demands your attention.