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Screeps is an open source MMO RTS sandbox game designed for programmers. The key focus is programming your unit’s AI, and controlling colonies by writing JavaScript which operate non-stop.

Key features of Screeps include:

  • Players write JavaScript AI which controls units 24/7 even while offline.
  • Huge persistent world.
  • Various units, base building, mining resources, territory control, economy, manufacturing, transporting, logistics and trading.
  • Only basic programming skills are required. Pro developers can really stretch their muscles.
  • Players edit scripts from the in-game editor, or using external IDE.
  • Players can host their own server, modify games rules and play with friends via LAN or on the Internet. No subscription required.