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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 and Semper Fi, and the For the Motherland version is roughly 90% complete. The HPP is the result of the efforts of the HPP team's four members of Slan, TheBromgrev, TZoli, 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.

Note that the mod currently is not compatible with the Their Finest Hour expansion, but you can still play the mod if you have the 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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