Two pleasantly surprising games on Xbox Live Arcade this week. First, there's South Park: Let's Go Tower Defense Play!, which is a tower defense game based on South Park, of all things. Then there's Lucidity, an original puzzle platform game from LucasArts. After taking a quick jaunt through the trial versions of both games, we're pleased to say that both of them are quite enjoyable. See what you're in for in the latest XBLA in Brief, and then decide if either game deserves your 800 ($10).
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