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Welcome to 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. HPL Engine The wiki provides documentation for the HPL Engine, Frictional Games' in-house game engine. The engine currently has three major iterations available, and a forth iteration being developed. Our knowledge base of technical information about using the engine and all of the related tools is posted in this wiki. 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.   Go to the HPL1 Engine documentation index HPL2 The second version of the engine was used to create Amnesia – The Dark Descent and Amnesia – A Machine For Pigs on a modified version of HPL2, often referred to as HPL2.5. You can find extensive documentation about the engine, including downloads for the modding tools and tutorials on how to create your own custom stories.   Go to the HPL2 Engine documentation index HPL3 The third version of the engine was used to create SOMA. A modified version of HPL3 is used for the upcoming Amnesia: Rebirth, and often referred to as HPL3.5.   Go to the HPL3 Engine documentation index

Frictional Games To do: Add some external links to modding-related sites or maybe a nice banner for fg wiki