Buildings

Every city has building slots: 4 in your capital, 3 in a major city and 2 in a minor one. What you build decides what you can field.

Buildings	What it does	Cost	Build time	Levels
Factory	Raises income; returns diminish as more cities industrialize	150 money	20 s	2
Barracks	Infantry and artillery; level II recruits 35% faster	150 money	12 s	2
Tank factory	Tanks; consume oil	300 money	22 s	1
Airfield	Fighters and bombers; +1 hop of air range	350 money	25 s	1
Shipyard	Destroyers and carriers; port for convoys. Coastal cities only	300 money	22 s	1
Fortification	+300 integrity and added defense per level	180 money	15 s	2
Anti-aircraft battery	Attacks aircraft within 1 hop	200 money	14 s	1
Refinery	Doubles oil extraction. On an oil field only	250 money	18 s	1
Missile silo	Worldwide missile range; each missile costs 350 money and 80 oil	900 money · 60 oil	90 s	1
Missile defense	Intercepts missiles within 1.25 hops; reloads in 20 s	450 money · 35 oil	35 s	1