Four maps, Plague Planet, Winds, Water and Thunder. Some of these levels are very similiar to some you might have seen before. They are all nicely constructed. They are large, but, not extremely large once you get to know the level layout. All maps have aliens for solo running and most all net modes are supported. This update merges in a proper physics model, adjusts alien behavior, and features better term graphics. (It also eliminates the individual versions from the download, decreasing size from 440K to 260K.)