Microsoft Combat Flight Simulator 2: WWII Pacific Theater

The gameplay takes place in the Pacific Theater of Operations, and includes campaigns loosely based on historical air battles, from both the American and Japanese perspectives. Because of the open-ended architecture of the Microsoft Flight Simulator series, the platform for this simulator, many enthusiasts have created massive amounts of extra scenery, aircraft, missions and campaigns. Source: Wikipedia, "Combat Flight Simulator 2," available under the CC-BY-SA License.