There are a few bugs in the simulation rules that have been discovered/exploited:
1 - Collision detection doesn't occur outside the rectangular area, so after lauching the armadillo to the top of the screen, it will pass through any materials and fall back down.
2 - When links overlap but don't have enough space to get away from each other (and aren't under enough force to break), they can move without any source or energy. This 'dark force' has been used to make engines (see the
Casius-ferris-wheel,
Casius-motorcycle,
Casius-Pistons,
Force Clockwork,
EscapeFromTheDarkForceFactory levels).
3 - Similarly to 2, when the armadillo is colliding with something, but there isn't space to resolve the collision (it's being squashed), it can revolve - creating movement with no source of energy.
The question is - should the game be changed to fix/remove these bugs/features? Changing the simulation rules would not affect 'normal' solutions significantly, but would obviously affect any levels/solutions which exploit them. Any changes would also make most spectator levels fail in their intended operation due to the 'butterfly effect' - since these levels rely heavily on the precise repeatability of the simulation.