Styx (Windmill game)
Styx was originally created by Windmill Software in 1983 and released as a copy-protected, bootable 5.25" floppy disk for the IBM PC/XT.
It is a clone of the 1981 arcade game Qix. Three significant differences are: the caterpillar (that can grow in size in later rounds), the introduction of diagonal movement (in contrast to Qix allowing only four directions), and the X1/X5/X10 multiplier that would color a claimed area corresponding to the color of the multiplier (also awarding that many points).
Styx was one of the few programs to make use of the 16-color quasi-graphics CGA mode (normally the CGA could only use 4 or 2 color graphics). However, it was possible to play on a monochrome monitor as long as the graphics card also supported color graphics (e.g. a Genoa Color Graphics Card).
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