Copy protection

The ZX Spectrum version has copy-protection. After loading, the game presents a set of four codes. These codes correspond to a color on the supplied color chart, blue, magenta, cyan etc. These colors must be selected correctly before the game will start. There are no second chances, get it wrong and the game must be completely reloaded.

Contributed by piltdown_man (151727) on Jul 19, 2010. [revised by : Patrick Bregger (211106)]. -- edit trivia