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, HOI2-style doctrines, capital ship modernizations, over 6,000 unique unit pictures, and much more.  The HPP has complete versions compatible with HOI3, Semper Fi, and For the Motherland.  The initial Their Finest Hour version is currently available for download as an Alpha.

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.

The mod's download files are split into two parts:  the mod's core files and an optional graphics pack.  The mod uses HOI3's built-in mod folder, so it will not work with JSGME or any other generic mod enabler, and the mod cannot be copied over the base game files.  The mod folder must be used.  Detailed install instructions are found in the downloads for each version of the mod.

Several submods exist for the HPP.  Among them are alternative counters, an Austria-Hungary mod, and an AI adjustment submod.  Since not all of the submods were created by the HPP team, for now they can only be downloaded from the HPP's forum.  Also, the following link will take you to the HOI3 Wiki's list of HPP Let's Plays:  Paradoxian.org

Note that while the mod's TFH version is currently in an early alpha release, you can still play the mod's FTM if you have the TFH expansion.  Older releases for previous HOI3 expansions are available here as downloads as well, but are not supported (aka we won't fix any bugs).  The FtM download has install instructions that explain how to install the mod if you have either FtM or TFH.

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Blog RSS Feed Report abuse Latest News: New Beta version of the HPP available, v3.2.0

0 comments by thebromgrev on May 9th, 2013

A new beta version of the mod is now available from the downloads section. Some database issues were fixed along with a bunch of AI adjustments.  We've been able to get to 1946 without crashes in our hands-off tests, so the mod is now in an unfinished beta state. Full changelog is in the download.  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.

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 a an experimental OOB for Japan and Manchukuo, where the Imperial Manchukuo Army is modeled as an expeditionary force under Japanese command.  This models history better, and we hope it will improve the Japanese land AI's performance.  By "improve" we mean "perform worse in a historical manner for balance reasons", because AI Japan is a real beast now and is doing way, way better than it did in the mod's FTM version.

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.

Downloads RSS Feed Latest Downloads
HPP TFH version 3.2.0 (May 09, 2013)

HPP TFH version 3.2.0 (May 09, 2013)

Apr 16, 2013 Full Version 37 comments

Latest full version of the mod, compatible with Their Finest Hour 4.02. The forum hosted on ModDB has a list of known bugs and issues. When you start...

HPP V2.0 Manual

HPP V2.0 Manual

Dec 2, 2012 Other 0 comments

This is the manual for the final Hearts of Iron 3: Semper Fi v2.04 version of the mod, and is only accurate for that version. Separate manuals are available...

HPP V1.0 Manual

HPP V1.0 Manual

Dec 2, 2012 Other 0 comments

This is the manual for the final Hearts of Iron 3 v1.4 version of the mod, and is only accurate for that version. Separate manuals are available for the...

HPP HOI3 Final Version V1.0

HPP HOI3 Final Version V1.0

Jul 9, 2012 Full Version 0 comments

This version of the mod is the final HOI3 1.4-compatible version. It is not compatible with any of the expansions. A pdf manual that summarizes the major...

HPP Semper Fi Final Version V2.0

HPP Semper Fi Final Version V2.0

Jul 9, 2012 Full Version 0 comments

This version of the mod is the final Semper Fi-compatible version. It is not compatible with HOI3 1.4 or HOI3:FtM 3.0 or later. A pdf manual that summarizes...

HPP FtM Version V3.0.0 (17 March 2013)

HPP FtM Version V3.0.0 (17 March 2013)

Jul 9, 2012 Full Version 25 comments

Latest full version of the mod, compatible with For the Motherland 3.05 or 3.06 only (if you have TFH, you can still play this mod, but you won't see...

Post comment Comments  (0 - 10 of 55)
cmgran6
cmgran6 May 9 2013, 3:08pm says:

Hello i am making a zombie mod and have all the ideas but no actual moodding knowledge, i would love to have a team that will make this while being steered by me. It will use the current map and some countries will be infected by zombies like russia will have lost many provinces and germany lost 3 or 4, america loses like 5 but the horde is aggresive and relentless. This would be for darkest hour 1.02.

-1 votes     reply to comment
delv213
delv213 May 4 2013, 3:28am says:

Still doesn't work properly for THF 4.02. The interface for tech is really messed up and it doesn't allow me to scroll to anything other then the main panel. No crashes though. Events activate fine but no Unit GFX's and certain leader pictures ie: Hungary's head of state.

I'll be awaiting the next patch.

+1 vote     reply to comment
thebromgrev
thebromgrev May 5 2013, 11:47am replied:

If the tech interface is messed up (as in buttons are in the wrong places) then you installed it wrong (remember, Windows UAC can and will screw up the mod's install!!!!!). All the tech interface files are included in the main download, so you shouldn't see buttons in the wrong places. When I create the download I zip up everything in my ../hoi3/tfh/mod folder related to the HPP, so the files I use to test with are the exact same ones you get when you download. The tech interface is fine when I load up the mod, so without knowing how you installed it my guess is Windows UAC is "protecting" your computer and screwing up the install. This is why the first install step is to copy your base game folder out of C:\Program Files. We've been working on this mod for over 3 years now, and seriously, 99% of all problems with the mod come from people not following the install instructions. The remaining 1% come from corrupted downloads.

The other gfx problems you see would be fixed if you downloaded the graphics packs from the addons section here. To keep the size of the main mod file down, we split out the unit and leader pictures into separate files from the main mod. I mention the graphics packs in the download instructions on this site. The tech interface borders and arrows (but NOT the buttons) are included in the Misc. graphics pack.

+1 vote     reply to comment
myballs64
myballs64 Mar 17 2013, 2:15am says:

I really want to play this, can someone tell me 1, how to install it and 2, can I get it for TFH? 'cause that's what I'm looking for.

+1 vote     reply to comment
thebromgrev
thebromgrev Mar 17 2013, 9:25am replied:

Go to the download section, click the FTM download, and read the install instructions :) All of your questions will be answered if you do that. Note that there is no TFH version available at the moment, but you can still play the mod if you have TFH.

+1 vote     reply to comment
battlefury13
battlefury13 Mar 5 2013, 9:54pm says:

Gonna check this out

+1 vote     reply to comment
llhnickerson
llhnickerson Feb 28 2013, 7:42pm says:

Please help. I really want to play this. I followed the instructions closely, but when the game is starting up after I launch the game with the mod selected in the launcher, the game will immediately crash after the loading screen reads Initialising Map-logic. An error message says that default.map could not be read. There is a default.map file in my maps folder in the mod folder. Please help.

+1 vote     reply to comment
thebromgrev
thebromgrev Mar 4 2013, 8:11pm replied:

No idea what it could be, since you didn't give me enough info. There's a lot that can go wrong if you don't follow the install instructions to the letter. Yes, they seem simple, but I'm always amazed at how many people screw it up somehow. If you can get to it, I have a Tech Help sticky in the mod's main forum that might help. Alternatively, what you're describing sounds like a base-game problem, not a mod problem, so the Paradox tech help forum might be of use too. Honestly, from what you've said it sounds like you left the game in C:\Program Files and have UAC turned on, but I can't know for sure until you provide more info. Please go to this site's forum and write down exactly everything you did in the bugreport thread. Easier to solve problems there than in the comment boxes.

+1 vote     reply to comment
llhnickerson
llhnickerson Feb 28 2013, 7:56pm replied:

Never mind, I at least got it to get to the FTM startup page. It had to do with the game improperly looking into the HPP folder rather than the other folder. So I just moved the HPP290 folder contents into the HPP folder and it was fine. You might want to put something about this in the install instructions.

+1 vote     reply to comment
thebromgrev
thebromgrev Feb 25 2013, 6:03pm replied:

You didn't follow the install instructions and copy the map cache correctly. Go back to the download page and check the install instructions again.

+1 vote     reply to comment
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Hearts of Iron III: Their Finest Hour Icon
Platforms
Windows, Mac
Developer
HPP Mod Team
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Official Page
Forum.paradoxplaza.com
Release Date
Released Jun 1, 2010
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