Pick a build (1–9, 0), click an empty tile to place. Click any existing tower to open its upgrade panel (Radar, Attack, Speed, Armor). Generators feed the global grid; batteries store surplus. Repair stations dispatch drones to fix damaged buildings. Brutes (purple) stop to chew nearby builds — runners and scouts speed past. Artillery hits anywhere on the map but fires slowly. Press N for a fresh map · R after game over.