The Historical Plausibility Project is a mod for Hearts of Iron 3 and its expansions with the goal of helping the game reach its full potential as a half-historical / half-sandbox game. The mod features a vastly improved AI, historical OOBs for every nation, complex internal politics, a reworked leadership system, the Soviet invasion of Poland, HOI2-style doctrines, capital ship modernizations, over 6,000 unique unit pictures, and much more. The HPP is the result of the efforts of the HPP team's five members of Slan, TheBromgrev, TZoli, SSmith, and Nephandus from the ParadoxPlaza forum, and its main forum is its official ParadoxPlaza forum, which Paradox requires proof of game ownership to enter. The HPP's forum contains the mod's FAQ, Submod downloads, country guides, and small hotfixes. In addition, part of the mod's previous work to the East Asia part of the map is now in the Their Finest Hour base game for everyone to enjoy.

Post news Report RSS Beta version 3.2.5 now available

A new beta version of the mod is now available from the downloads section. More AI adjustments, lots of background fixes, and a few of the most glaring bugs were fixed. In addition, armor and piercing is now in the mod, though it is in an unbalanced state at the moment.

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A new beta version of the mod is now available from the downloads section. More AI adjustments, lots of background fixes, and a few of the most glaring bugs were fixed. In addition, armor and piercing is now in the mod, though it is in an unbalanced state at the moment. Please note that you should delete any previous install of the mod and save games, as this version is not save-game compatible with the previous TFH versions.

HPP TFH version 3.2.5 (May 28, 2013)

The main changes revolve around database fixes, localization (in-game text) fixes, AI adjustments, and a buggy few events and decisions were fixed. Also included is are initial armor and penetration values for units and techs.

The mod is now in a beta state and we expect there to be bugs, but no crashes. If you follow the install instructions to the letter then it will start up without any problems; I'm testing with the exact same download you guys will get and I follow the instructions I wrote down in the download section and can start up the mod with no problems, so if you're getting startup issues then go double-check the install instructions. Once the game starts though, there may be buggy AI behavior due to TFH changes to the AI system from the FTM expansion. If you get a crash or see the AI fall asleep or build/research something silly then PLEASE comment here, in the ModDB forum for the HPP (check out the forum link to the upper-right, next to images), or the mod's main forum (official page in the mod's profile to the right) telling us what happened. The more detail you can provide the faster we can fix the bug or crash.

For AI-related bugs, it would help tremendously if after you quit the game you would go to the folder Documents\Paradox Interactive\Hearts of Iron III\HPP\logs, open the file system.log in notepad or some other editor, and check the bottom of the file for errors. This file is deleted every time you start the game, so please look at it and report any errors at the bottom before you start the game up again if you saw the AI fall asleep. If you do see any errors please report them, because the errors will point us to the files we need to fix.

Also, please keep in mind that generating the map cache can take a long time and hog up a bunch of memory. If you have an older computer, you may want to go to Documents\Paradox Interactive\Hearts of Iron III\map and copy your vanilla cache folder to Documents\Paradox Interactive\Hearts of Iron III\HPP\map (make this folder if it doesn't exist). This will bypass the map cache generation. You'll lose out on the visual region changes (the thick black borders on the map), but nothing else.

Known issues:
*Game will crash if you try to view strategic resources in the statistics screen.
*Carriers that start the game in the production queue (only JAP and USA are affected) will be built as the wrong model. For some reason, TFH is ignoring our carrier models that are in the build queue at the start, and only our carrier models; all other ships are correct, and the carrier models are correct for existing ships and ones you build after the game starts.
*No one can build any of the historical treaty ships like the King George V or Richelieu if they signed the treaty. This is being worked on, but the new event chain isn't ready yet.

NOT bugs:
*Anything you also see in the base game is obviously a base game problem. I'm talking about stuff like the music stops playing, the interface disappears, supply system is stupid, allied nations do nothing, etc. Things like missing cores, AI not researching infantry techs, and events not working are mod-related bugs. Basically, if you see an issue related to the interface not looking right, music/sounds not playing correctly, or what the AI does on the map, it has nothing to do with the mod since those areas are hard-coded.
*If pictures are missing or wrong, then you didn't install the graphics pack from the addons section.
*If the mod doesn't start up, then you didn't follow the install instructions

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