If you want to mod it, or just look at it, you might be surprised. If you want to continue to Vic2 and HoI4, you'll need to use third party tools. You can only access it if you have converter DLC. Mod setups starting map, rulers, and whatever else it felt like including.ĬK2 to EU4 converter is a builtin feature of Crusader Kings 2. In theory you could convert save game to save game, but converting to a mod is much more flexible, so that's the generally used method. There's been many converter tools which take save game from one game and create a mod for another. Or if you really want to, go ahead, just don't say I didn't warned you.

Megacampaign is not a meaningful achievement run - with so much time it's inherently going to be pretty easy past first 100 years, other than for self-imposed challenges with which ironman will be of no help.

Ironman mode uses special save format which is pretty damn hard to 'un-ironman' and edit if necessary.

CK2 is notorious for breaking saves any time trait list expands because they couldn't be bothered to include 10kB trait id to trait name mapping table in each save game.

If any of the games receive updates, you might need to do some fixing.

It's bad enough when game bugs out and you need to fix it by console, but when it happens to your campaign you've been playing for literally months, it can be really devastating.

Conversion process is never perfect, so you're very likely to want to tweak some things with console commands or save game editing before and after export.

I'd generally dislike ironman, but it's even more important not to play ironman for a few reasons: Since Paradox games make it hard to avoid blobbing, you pretty much have to play with mods, severe self-imposed restrictions, switch countries every now and then, or otherwise do silly things or your second/third/fourth campaigns will be pretty boring. Possibly even chain multiple such games, like CK2 to EU4 to Vic2 to HoI4. Paradox Grand Strategy games cover very long time, and most people never even 'finish' a single game of CK2, or EU4 - but it's possible to go the other extreme and play a 'megacampaign' - start in one game, then convert to another, and keep playing. There's very little information about this wonderful thing, so after doing some research I decided to write it all up.

Edit eu4 save file location