>>2066550 (OP)>2Baseline learning tool.
While technically there is HoI1, it's a crudely reworked EU2 with a WW2 outer shell grafted to it and it's very clunky to play (don't get me wrong, it's a fine game with few unique features that I still miss, but I would never recommend it as someone's first HoI). So your best bet is vanilla 2 to even get into this game and see how it works
>DH2.5: Electric Boogaloo.
Originally an extensive improvement mod, eventually a stand-alone thing. You DON'T want to start with it, because you will be lost due to the amount of optons added to baseline 2 (especially research), even if it has also a fuckload of QoL stuff that vanilla 2 sadly misses.
Once you learn how 2 plays, this is a strict improvement to it on all fields, but you MUST start with 2 to both grasp the game easily and also learn to appreciate what DH does with it (since not all features are straight-up upgrades, they merely change how the game operates)
>3There are two camps to it: people who like its logistic, research and division construction systems - and everyone else. This is a love it or hate it game, and the game outright assumes you came to it as a veteran 2 player that understands all the pre-existing game concepts and mechanics. You will get filtered HARD if you come to it as your first HoI - not due to the game being difficult per se, but due to the amount of the moving blocks in it.
There are two important mods to it:
- HPP, which solves a fuckload of baseline game issues and making it sort of HoI3: HoI2 edition (it makes sense in the context) while also solving bunch of problems 3 had on its own. As far as I'm concerned, it's better to play HPP as your first contact with 3 if you came from 2, than jumping to vanilla 3.
- BlackICE, which is pure, undiluted 3 autism on crack. If you enjoy 3 in vanilla, you will love it. Otherwise, you will get severe lead and mercury poisoning. The only game (mod) where naval combat works, is worthwhile and AI can into it, too