What it is:
Global Conquest is an empire-type game, like the venerable Strategic Conquest: you move units to capture cities, with which you build more units, to capture more cities. Infantry, tanks, battleships, carriers, subs, planes, spies and "comcens" (king pieces) are the units. Sea, plains, mountains, swamps, forests and cities are the terrain types. Each city can support a limited number of units, or can switch off production in order to save money, which can then be transferred to a city near the front to speed up production there. You can tweak the scenario settings to have resources (oil and minerals) control the availability of certain units. The settings also determine how big the map is, how many mountains, how much land, etc. etc. Two flavors of random events are available, and several ways to play multiplayer, which is what the game is really about. The AI is nothing special and you'll have to handicap yourself heavily (also tweakable) to give yourself a challenge.