The setting of the game, Paragon City for Heroes and The Rogue Isles for Villains, was divided into different Zones accessed through in-game transportation systems. Especially dangerous zones called "Hazard" or "Trial" zones, which teemed with larger groups of enemies, were marked in red on the in-game map and were much more dangerous than normal zones. The Villains' setting, the Rogue Isles, consisted of islands connected by a network of ferries and helicopters while the Heroes' setting, Paragon City consisted of regions separated by giant energy "War Walls" (which were justified in the back story) and were connected by direct access points and a Metropolitan Transport system styled on a light rail. A few zones were accessible to both heroes and villains; some were cooperative zones, while others were player versus player (PvP) zones. Praetoria, for characters created in the "Going Rogue" update, lacked War Walls, allowing more or less free movement between areas.