A four-story house, with a yard. Overall, this is quite impressive. The attic is great, and the sniper positions outside are pretty cool. The interior (first and second floors) are a bit cramped... but what would you expect, running around a house with weapons of destruction? Check under the stairs in the basement for a Bungie-esque joke.

Twelve levels. These tend to be huge, open areas, with smaller side areas. Texture choices are odd, in some cases (and overabundant in most). The levels seem to get better as you go higher in the map set (although I encountered a freezing bug in the last level). A couple are extremely high in alien count.