Playable nations: Superpowers, Powers and countries with (somewhat) realistic potential to become Powers.
-Soviet Union, United States;
-China, France, India, Japan, United Kingdom, West Germany;
-Brazil, Egypt, Indonesia, Iran, Israel, Italy, Mexico, Nigeria, Pakistan, South Africa, Spain, Turkey, Yugoslavia;
That's 21 countries, with a few more/less perhaps. (Australia, Canada, Saudi Arabia, South Korea, Sweden)
Rest are unplayable.
Game would progress like this:
-Stabilize your country
-Out-compete your neighbors in production & trade, and become an important player in the world economy
-Join a military alliance and influence/destabilize minor nations
-Spy everything
-Fight local and proxy wars
-Destroy (or not) the world
-Build a colony ship /s
Differences from HOIIV:
-Wars would be simpler.
-Construction and buildings would not be much different, although it would be more optimized for civilian economy.
-Trade and production would be more complex, but not too much.
-Internal politics would be present on a simplistic level.
-Technology would be similar, but on a larger scale.
-Diplomatic interactions would be significantly improved.
Bread and butter of the game would be diplomacy and technology development and race.