The courses of PlanetPenguins Racers, or ppracer as it is called for short, are quite easy to create. They consist of three graphic files and one textfile. . This package contains some scripts and colour palettes, which make it easy to create the graphic files of ppracer courses with the GIMP. . Details on how to create courses can be found at http://tuxracer.fubaby.com/articles.php
