Fortress Circuit

Defeat the raider with three charged cannons while keeping the fortress alive. Build 2×2 circuits in the lower three rows: three power P cores plus one coolant C makes a cannon; two P plus two C makes a repair shield. Other mixes burn out and cost one hull. The raider hits for two hull after every four placements or Waits. Select a completed circuit, then Fire: a cannon deals two damage only if its two columns cover the raider’s current lane; a shield repairs four hull. Fired circuits clear their four squares for reuse. The raider switches between the left and right edge after each hit. Your eleven power cores and five coolant cores exactly cover three cannons and one shield, so time the repair rather than building only weapons. Keyboard: Tab and Enter/Space operate buttons; R restarts.