While waves of demons attacking the outposts of our planet would seem old hat, occasionally a rare spark in programming comes up with something that lifts a game out of the ordinary. Imagic have certainly managed this, with smooth graphics and the most imaginative demons I've yet seen.
Using a laser cannon moving across the bottom of the screen, you are battling against six waves of attack by ten different species. Each generation gets faster and more agile and, since they are armed with fairly smart missiles, you need to be very quick.
Having succeeded in defeating the irate beings, the cannon moves across a starry background to their base, Pendemonium, on the lunar surface. A demon, flanked on either side of what seems to be two giant cobras appears. Eagle-like creatures descend at speed and they also need fast bursts with the trusty laser.
Having overcome these obstacles, the demon's head detaches itself, but is protected by suicidal patrollers which proceed to hurl everything at you.