Room Control Level

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A room's control level (RCL) determines what and how much a player can build in a given room. It only applies to owned rooms, and it can be upgraded by a creep using energy.

When a room is first claimed, it is at RCL 1. Each level takes exponentially more energy to complete, until the transition from RCL 7 to 8, which costs 10,935,000 energy.