Downtown Decay is the third-to-last zone of the game, unlocking at 900 Starpower.
Units unlocked here
As a battleground
Downtown Decay is a cramped place with a large gap in the middle. There are two mountains on this map, each one on the top and bottom sides. Flying units can exploit the middle area, instead of going around it. For each player, one Extractor is located at the top side, and the other Extractor is on the bottom side.
SENSO-Gate and Extractor locations
Each SENSO-Gate is located on the top-left and bottom-right corners of the map while the Extractors are placed inwardly, one near the middle and the other near the left or right edge.