The scary Penumbra game trilogy, has just recently been ported natively to GNU-Linux by the manufacturer, Frictional Games. The Penumbra games are first person survival horror and physics puzzle games which challenge the player to survive in a mine in Greenland which has been taken over by a monstrous thing. The game is remarkable for its physics engine - the player can grab and throw pretty much anything in the environment. The physics engine drives objects to fly and fall exactly as one would expect.