As a result, "Minerva" maps have a much shorter load time than maps in the original game. Foster creates the maps in layers. Once a layer is filled he moves the design downwards, which both helps to propel the storyline (a descent into a mysterious shaft) and also makes the best use of space. Visually the maps are of a high quality, with HDR lighting implemented in the latest release, and the environments match those of the official game in look and feel.