Beamng.drive V0.18.4.1
Hidden in the game files under experimental_lua was a toggle for "Deformable Mud." While incomplete, modders quickly activated it. For the first time, a truck could sink into a muddy riverbank, leaving ruts that persisted for the session.
Before BeamNG.drive v0.18.4.1, the game looked good for a physics sim. After the update, it looked photorealistic. BeamNG.drive v0.18.4.1