Spanish company Dinamic Software originally created the ZX Spectrum, Amstrad, PC and MSX versions. When the game got distributed in the UK by Imagine, Imagine themselves developed versions for the C64, the Atari ST and the Amiga to maximize the profits.
Those systems were not popular in Spain at the time, which explains why Dinamic didn't bother to port the game for them. Eventually, though, most Spanish companies, Dinamic included, ended up programing for them. Add