is it possible to make an mmo OGame or Travian like with C2?
if yes, is there anyway kind of guide?
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Yes, but, first make sure you are very familiar with Construct 2. There are turorials for working with multiplayer in the tutorial section.
yes, very possible. However I do not recommend using C2 as the backend server, but just as the client/browser side of the game. SQL+scripts (perl/php/ruby take your pick) will work much better.