EMERGING from the perils of Styx unscathed is not easy. A three-level arcade/adventure game for the 16K Spectrum, it has a spider-filled maze at the top of the screen, a piranha-infested river fringed with deadly seaweed in the middle, and infernal regions haunted by an evil, shrouded figure at the bottom. All you have on your side are fast fingers and your laser power. Nevertheless, a reasonably lively game, if you do not let the piranhas get you down. Styx can be obtained from Bug-Byte, Mulberry House, Canning Place, Liverpool.