Algodoo

Watch out for the laser-triggered turrets, pressure mines, bottomless pits, lightning bolts, satellite radio energy transfer beams, and flimsy bridges that stand in your way.

You may not:
Use any materials with a density greater than 20
Use immortal materials
Use any scripting
Alter the map in any way
Use killer materials to kill any portion of the map
Use geometry controllers
Use collision layer G
Use attraction

You may:
Move the black matter before starting the course (this is the only exception to the map altering rule)
Use killer materials in your mechanisms, as long as they do not kill parts of the map
use any number of components
Use any kind of device, wheeled, tracked, flying, or otherwise