You are a Runner. You are free to roam over the city's rooftops, within its buildings and around its streets.
GM_Freecity_Plaza, unlike GPK_Freecity, has a slightly more linear path to its gameplay. You start on one side of the level and travel to the other. Notes: Custom models now let the scene become a lot more detailed, so there are no more worries about reaching the map compiler's limits. GM_Freecity_Plaza took almost 10 months to complete, and has been my most ambitious project so far.
No extra gamemode is required; this map is best run on Sandbox.