Talk:MMO/@comment-173.238.214.17-20130524174943/@comment-9042171-20130524183623

look at Research Unlocks page and Custom Game Engine page:

in R&D Lab research Internet Opportunities and then MMO and after that any staff member can research MMO support feature and with that you can make custom engine that is needed for MMO games.

If you haven't R&D Lab opened you need to get to Office Level 4 (one that let you have 7 staff) and train one of staff member to be design specialist. After that you can open R&D Lab. All these information are at Research Unlocks page too.