City
120 gold · instant
+300 troops now, +cap and growth; linked factories add troops
Factory
110 gold · 15 s
+2.2 gold / s, +30% per supply line
Port
160 gold · 20 s
Coast only, 20 s to build. Ships, trade, +gold
SAM site
220 gold · 30 s
Near-certain kill on hostile missiles in range, 2.5 s reload. Knocked out under bombardment
Missile silo
420 gold · 120 s
Launches missiles; 20 s reload per silo
Bastion
90 gold · instant
Doubles the cost of taking nearby land. Destroyed if overrun
Missile command
350 gold · 90 s
Controls silos within 45 tiles and fires them at high-value targets. Overlapping centers make missiles cheaper
Shield generator
900 gold · 150 s
12-tile dome that stops every missile aimed inside it, 100%, losing 2 of 10 hit points per hit. Repair from the right-click menu
Coastal battery
420 gold · 60 s
60 s to build, coast only. 34-tile gun, 3 damage every 8 s. Knocked out under bombardment
Shore guns
150 gold · 20 s
20 s to build, coast only. 14-tile rapid fire: shreds transports and light ships
Big Bertha
700 gold · 120 s
60-tile artillery, one shell every 20 s at the nearest enemy building. Cannot be intercepted
Airfield
600 gold · 90 s
Hangar for up to 4 aircraft; buy fighters and bombers from its right-click menu. Spy planes fly from here
Flight operations
400 gold · 60 s
Runs your air war: buys aircraft (keeping a gold reserve), keeps fighter patrols over your assets, recalls damaged pilots, and strikes with bombers when the sky is clear
Submarine base
450 gold · 60 s
60 s to build, coast only, needs a level II port within 34 tiles. Builds attack subs and hunter subs
Engineering command
450 gold · 60 s
Sends up to 4 repair trucks over your contiguous land to fix shields, airfield shields, guns, Big Bertha and port II guns, 15 gold per pip
Troop command
400 gold · 90 s
+10% troop growth each, up to four. With Garrisons it runs logistics: heavy transport or paradrop to any area under 40% of home density, keeping a reserve
Radar station
180 gold · 20 s
Reveals 45 tiles around it (fog of war)
Long-range radar
500 gold · 60 s
Reveals 110 tiles around it (fog of war)
Radar jammer
400 gold · 45 s
Blanks enemy radar stations, long-range radar and radar ships within 30 tiles. Eyes still see: territory, warships, spy planes, satellites
Satellite launch site
900 gold · 180 s
Launch a spy satellite for 400 gold: the whole map for 45 s
Notes
| Spacing | Buildings need 6 tiles of clearance from each other. You don't have to be exact: click within 5 tiles of a valid spot and the building lands on the nearest tile that fits (coastal buildings on the nearest coast). |
| Supply lines | A factory links to every city and port of yours within 34 tiles (4 per factory, 3 per city, 2 per port). Each line: +30% gold for the factory; +1.2 troops/s per line for a city; +1 gold/s and 15% cheaper ships for a port. |
| Construction | Sites do nothing until finished, can be captured (progress kept) or bombarded, and cancelled for half the gold. A city with three linked factories speeds nearby building by 25%. |
| Cities | +300 troops the moment they're built. |