Greater Diplomacy 4 has a map editor, so you can make your own maps if you feel like there aren't enough scenarios to play around with. It also allows the player to upload their own mods, and includes local multiplayer so you can play with other people! The local multiplayer has to be on the same computer though. It's not online.
Greater Diplomacy Hex Edition is so different from the other versions that I don't consider it a continuation of the series, but rather a very interesting offshoot. Its most prominent feature has to be the fact that it uses a hexagonal grid instead of normal tiles, but that's not all I packed into this monstrosity. There's 8 different types of units, 3 different types of resources, and naval combat exists.
Greater Diplomacy 3 allows you to save your game and load it in later, so you don't have to lose your progress if you need to turn off your computer for something.
Personally I think Greater Diplomacy 2 has too many provinces, making playing it feel less fun. It does feature a tutorial though, which is very helpful for new players.
Like Budget HOI4, you can play against the AI, but you can also play it with up to 8 other people! However, you all have to be on the same computer. It's not online.
A significant improvement to my first strategy game, and the first time I made an AI you can play against.
My first attempt at making a strategy game. It works, although not very well.
