Players will choose a mentor for their character (such as Superman, Batman or Wonder Woman for heroes and Lex Luthor, The Joker, or Circe for villains). Their starting location, principal quest rewards and mob loot will be influenced by that decision. The starting zones are either Metropolis or Gotham City, for both heroes and villains. Heroes can also go to the Justice League Watchtower, while villains can enter the Legion of Doom headquarters. Other zones can be reached by teleporters from the two faction headquarters.
Each character is given a communicator appropriate to their faction, via which they receive urgent communications from their mentor and his/her colleagues and subordinates; heroes will frequently receive status updates from Oracle, while villains will receive data from The Calculator. In addition to assignments from their mentor, player characters may also receive requests for help from other mentors of the same faction. Player characters may also accept missions from NPCs in the street, usually minor characters from their faction. There are also opportunities for quick street encounters appropriate to the character's faction: for example, a hero character may encounter a thug robbing an armored truck, trying to break into an office building, or in the process of mugging a citizen; while a villain character may be presented with opportunities to assist NPC thugs with an armored truck robbery, or assault a citizen using an ATM. All NPC interactions are fully animated and voice-acted. Player characters will earn threat ratings that will cause NPC heroes and villains to interact accordingly with the character.
The shared worldspace offers primarily solo and team player versus environment (PvE) gaming opportunities in the form of open air missions and instances, although player versus player (PvP) combat is also possible in this worldspace. Other PvP (and to a smaller extent, PvE) gaming is available in various types of queued instanced encounters: "Legends", small scale PvP combats in which players take on the identities of iconic characters (continued success in Legends combat unlocks additional iconic characters); "Arena", small scale PvP combat in which players fight as their own characters; "Alerts", cooperative team missions; and "Raids", large scale PvP combat between teams of opposing factions. Success in PvE missions is rewarded with in-game money, costume pieces, equipment and consumables, while PVP combat is rewarded with unlocks of special equipment sets.