I don't think I've encountered all that many cool physics in games, but two come to mind. First is Half-Life 2, for obvious reasons (the obvious reason being the gravity gun). It's ancient at this point, so enough of that. The other is Cities: Skylines with its water physics. Fluid simulation can be quite intensive computationally, and Cities: Skylines doesn't handle it too well either, but it works well for the game anyway. Build a dam? You're going to end up with an artificial lake, causing the river downstream to dry up a bit in the process. The same goes for everything: terraforming affects water too, water pumps suck up the water, and there can be flooding (there's flood walls for dealing with that).







