Friction
Off:
Small:
Medium:
Pea Soup:
Boundary
None
Bounce
TORUS
Delta T
Fine
Medium
Coarse
Speed
Slow
Medium
Fast
Lightning
Trails
Off
Short
Long
Infinite

Mouse Events:
Grab the bodies to drag them
while the world is stopped,
or fling them while
the world is running.

Worlds
Test
Fourbit
One Mooon
Ringworld
Big Crunch