TQ Digital's Zero Online is a sci-fi MMO that features action in the form of space combat. The story concerns a mysterious force known as Othello. Is Othello an alien invader, the "ghost in the machine", or something else?

Players can select Infantry or Artillery combat classes, each of which have their own pros and cons. In addition, each class has the ability to operate up to three battle mechs and command units -- with the ability to transform these units into an assortment of items depending on the situation.

In addition to combat and space duels, there are other PvP modes to fill your time, quests, resource collection, and more. The game is free to play and item shop supported.