I tested mass physics in UE4 and set up a little hoover vehicle that can shoot bullets to bring down a wall of 1600 stacked cubes.
It was a test, but one could think of scripting buildings from the cubes, or any other levels, and try to rescue the ragdoll that is sitting on the wall. Just adding a grab arm to the hoover vehicle.
All this has been tested with the idea of physics based gaming behind it. Everything in the demo is physics based. No scripting/animation at all.
Download link to packaged project:
https://drive.google.com/file/d/0B_g3hVIuNxkUZXVCZGd6S3FDWGc/view?usp=sharing
controls:
Start: start the application with the U-icon; exit - close the window
Controls are for gamepad (Xbox Pad): LeftStick-move, RightStick-Camera,Press RightStick-reset camera height, SelectButton-cameraZoom, ToprightShoulderButtoon-Shoot, TopleftShoulderButton-impulse thruster