This is kinda cool. Harks back to playing Space Invaders, Centipede, PacMan, etc., back in the days of the early electronic arcade machines, and for that matter, their primitive DOS and Unix computer game counterparts. I managed to knock out all but a handful of greeblies before I met my death (I only tried once), and the last time I played anything like an arcade game had to have been in college, so we're talking early '80s at the latest. Click on the blue link above (not the picture) to have fun with it.