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Welcome to the official Frictional Games Wiki. This wiki is a combined effort of the studio and the community, and is a constant work in progress.

If you would like to contribute to the wiki, please check out our help section.

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HPL Engine

The wiki provides documentation for the HPL Engine, Frictional Games' in-house game engine. The engine currently has three major versions available, and a fourth version under development. Technical information about using the engine and all of the related tools can be found here.

HPL1

The first version of the engine was used to create the Penumbra series.

The engine is open-source and licensed under GPL, and can be used to create non-commercial projects, but documentation is rather limited.

HPL2

The second version of the engine was used to create Amnesia – The Dark Descent. A modified version of HPL2 was used to create Amnesia – A Machine For Pigs, often referred to as HPL2.5.

You can find extensive documentation about the engine and the games below, including downloads for various tools and tutorials on how to create your own custom stories.

HPL3

The third version of the engine was used to create SOMA. A modified version of HPL3 is used to create Amnesia: Rebirth, often referred to as HPL3.5.

You can find extensive documentation about the engine and the games below, including downloads for various modding tools and tutorials on how to create your own mods.

Frictional Games

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Browse Amnesia: The Dark Descent Mods | Browse SOMA Mods | Browse Amnesia: Rebirth Mods