Galaxy is a one-off bingo with a 24 hole playfield.
You cannot bring the ball back to a ball return on this game.  You can actually return one half of the numbers to shoot again.  You can also move two columns at a time up or down one position (on this 6x4 card).
This game does not have the spotted numbers features from Miss Universe (another interesting experiment), but it does have extra balls.
Galaxy looks like it was completely engineered to make you lose a ton of money, quickly.
Backglass:

Cabinet:

Playfield:
http://bingo.cdyn.com/machines/bally/galaxy/resources/pf-galaxy-1.jpg