Devil Zone

Devil Zone is yet another Galaxian style space shoot-em-up, but this one has been given a pseudo-3D appearance. On each level, a rectangular grid of space devils appears in the distance. Small groups of four break off to swoop and shoot at you. Your ship can only move side to side, and shoot forwards, yet must destroy all of the devils before moving onto the next level. Extra points are scored if the last devil of each small group is killed further away from your ship. Subsequent levels (or ranks) are populated by faster devils.