Penumbra: The Remake

[Tanshaydar]

You need to talk to Frictional Games as they are the owner all of the assets.
You may want to use HPL1 to update it. If you want to use HPL2, it will be a very hard process for you to recreate maps, as they are wholly modeled in Blender; and use much different pointer things that I don't know of.

HPL1 is opensource and downloadable. You might want to take a look at it first.