I've been meaning to play HOI for a while. I was put off by the short time frame it's set in - feels like I need to understand how they handle that compared to multi-hundred year timeframes in EU4/CK2. Mind Vicky is roughly 100 years but still great replay value but still 100 years is longer than a decade or two? The mod might be the push I need to check it out :)
By "link up", I didn't mean the same game. I meant something like a save converter that takes your CK2 save and you can use it to seed the world in EU4. Then it's just a case of doing that up the chain and filling in gaps with new games (I believe timeframes of CK, EU and V sit back to back).
They do have an official save converter[1]. Not sure if it works with the latest versions of CKII and EU4 but it's definitely worked in the past.
Hell, you used to be able to do the "Grand Campaign" where you play CKII->EU4->Vicky->HOI to cover about a millennium of history. Once again though, not sure if the save file converters have been updated enough to do that now.
By "link up", I didn't mean the same game. I meant something like a save converter that takes your CK2 save and you can use it to seed the world in EU4. Then it's just a case of doing that up the chain and filling in gaps with new games (I believe timeframes of CK, EU and V sit back to back).