Styx

A variation on QIX: claim the playfield by building walls and closing off smaller regions. The chief obstacle is the colorful Styx, which (fittingly) resembles a bundle of sticks, and prowls about the screen in unpredictable swirls of motion. Unlike QIX, you can draw both straight and diagonal walls; another difference is the scoring, which depends on a cycling multiplier: time your conquests right, and you may even increase your bonus tenfold.