Old Surface City

The Old Surface City (旧地上都市) is a location from the first Mega Man Zero game. It is a ghost city abandoned long ago. Fugitive Reploids labelled as Mavericks by Neo Arcadia eke out a living hidden under the high-rise buildings and rubble. The Resistance Base is hidden under the city. To the left of the base is the entrance to the Desert, and to the right is the entrance to the Subway Ruins and the Disposal Center.

The Disposal Center (処理しせつ / スクラップ処理場) is a facility used by Neo Arcadia to dispose of anyone they consider to be "Mavericks". After her rescue, Ciel asks Zero to destroy the facility to prevent further retirement of innocent Reploids. Zero arrives on time to rescue one Reploid and two Mechaniloids from Aztec Falcon.

After the player completes (or fails) 4 missions after the Disposal Center, Hittite Hottide will be deployed by Neo Arcadia to destroy/weaken the Resistance Base, being released in front of the Disposal Center and passing through the old city until it reaches the base. Zero must destroy it before it reaches the Resistance Base.