There are three different classes of robots in Mars Frontier.  Each has its own building for the production of units within that class, meaning that three units can be produced concurrently.  Strangely, only one unit can be repaired at any one time, regardless what classes your damaged robots are.

The Rover class uses the Robotics Lab to unlock new units and research upgrades, while the Transport and Gunship classes share the Research Center for unlocking and upgrading.

Robot ClassesEdit

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