The Main bases have two entrances into and out of them. There is a cliff around the main base for you to defend as well. There is only 2 expansions, the top and bottom of the map, and there only available by dropship. Starting minerals switched to 2000 (instead of 1500) and vespene gas to 6000(instead of 5000. There is only one way from the top and bottom of the map and that is the middle. There is a structure placed in the middle for you to control and guard the path.