DLC for Defense Grid: The Awakening
In this first full-story expansion to the award-winning Defense Grid, GLaDOS, the menacing AI from Valve’s awesome Portal franchise, guest stars and shakes up the Defense Grid world.
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So, what do you get if you combine Defense Grid with Portal? A really amazing DLC. The maps for You Monster are very different than the maps in any of the other Defense Grid DLCs. First, it's based off Portal complete with insults from GLaDOS. Second, a lot of the maps are more than just stopping the aliens, GLaDOS interferes by limiting what towers you use and so on. If you like Defense Grid and Portal you can't go wrong with this DLC.