Trackballs is a simple game similar to the
classical game Marble Madness, on the Amiga,
in the 80's. By steering a marble ball through
a labyrinth filled with vicious hammers, pools
of acid and other obstacles the player collects
points.

When the ball reaches the destination you continue
on the next, more difficult, level - unless, of
course, the time runs out.

You steer the ball using the mouse and by pressing
>spacebar< you can jump a short distance.

When all levels are finished, an editor mode permits
to create new ones ("trackballs -e").
All is explained in the docs.