More Duke Nukem 1 fun facts: The red bouncy mines don't actually bounce off the floor. There's no collision detection or physics there - they just move up and down by a fixed amount. If you place one higher up, it bounces in the air 😄
This is basically the entire movement logic:
https://gist.github.com/lethal-guitar/6ca0aa69786c7ad8a2319489503850b0