It's an interesting game that literally lets you take control of any country that exists at the time of the scenario (1936, 1938, 1939, 1941, and 1944 scenarios exist). Though you might have limited fun playing as Tibet
You control research and production of your country, as well as trade and diplomacy. A wide variety of unit types exist, in land, sea, and the air. Doomsday is coming out soon, which includes the original HOI2, as well as some other neat features (spies!). It also includes a new scenario, as if WW3 against the Soviets was sparked shortly afterwards. It also extends the base game from 1947 to 1953.