I'm looking for a challenge in Europe and there are a lot of challenges in them if you can imagine it. 
I will also count nations that aren't in the game in 1444 but can be released on the first day, i.e Wales.
I also wouldn't want it in the HRE, since almost all nations in the HRE are easy.
I will also count nations that aren't in the game in 1444 but can be released on the first day, i.e Wales.
I also wouldn't want it in the HRE, since almost all nations in the HRE are easy.