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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 in this wiki. HPL1 contains the documentation for Penumbra: Overture, Penumbra: Black Plague and Penumbra: Requiem HPL2 contains the documentation for Amnesia – The Dark Descent and Amnesia – A Machine For Pigs HPL3 contains the documentation for SOMA and Amnesia: Rebirth HPL Engine Documentation   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. HPL1 Engine documentation 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 Engine documentation 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. HPL3 Engine documentation HPL1 Engine documentation HPL1 Engine documentation HPL2 Engine documentation HPL3 Engine documentation

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