An interesting GOTM. At the start it was hard to know what units would be needed to capture AI cities, with no robotics or advanced flight, the alternative, stealth bombers were expensive and tanks are not much good against city walled defender (which I assumed the AI would build). I formulated an island hopping plan involving stealth bombers and paratroopers for the attack and capture, and to build cities 6-8 squares from each other to allow both the troops and bombers to jump along finding AI cities on the way. I hadn't fully appreciated how big the map was, and although this took time, it worked in the end. The only Wonder that seemed to help was magellans, and I built that very late, for a higher score cure for cancer and early pyramids helped. UN was not much help as the AI wouldn't swap maps.