A Massively Multiplayer Online game (MMO) is a feature that can be developed at the R&D lab. In order to gain access to MMO, the player must first develop Internet, which unlocks both MMO and Codename: GRID.

After MMO is developed, MMO support for engine will be available for research by the player or his/her employees. The player must then develop an engine with MMO support to make MMO Games.

MMO concept
Conditions for required researches for MMO are at Research Unlocks page.

Once a MMO is made, it will kind of work like a custom console, with maintenance (Although a different kind) needed, however you may constantly make money. As time goes on, you will steadily make less and less money, while maintenance remains the same. If you don't feel like pulling down a MMO by right clicking the tab and removing it, you can try making expansion packs to make it popular again.


After releasing it, you can research expansions and then develop them. Although not a complete game, it can improve an MMO and raise its income. It can be developed just like any other game

  • If you cannot steadily produce the expansions before the maintenance costs rise, it is encouraged to take the MMO off the market. To do so, left-click the MMO's Net Income/Net Loss Bar Graph and select "Take off market."

Start a Discussion Discussions about MMO

  • mmo - do you need to select online play and cooperative play?

    3 messages
    • they may be required to build an engine (I'm not even sure), but no feature is mandatory when building a game itself
    • I Made a Racing/Simulation MMO without multiplayer or online play or coop play and I got a 10, 9, 10, 10. I went from 2 mil to 100 mil and it ...
  • MMO - When should I start one?

    2 messages
    • I've read through the wiki page for MMO's and I was wondering if anyone could tell me how much money I should have before actua...
    • I've found the best time to do so is once you hit the 30 mil mark. You've got enough financial backing then that you can afford to ...