Version 3.84 of the game will only work correctly on OCS machines, due to an error made by the programmer, Richard Aplin. (One piece of code that sets the modulo was incorrect, making the game display improperly on ECS machines).
 Shortly after the release of v3.84, Richard Aplin became aware of the error, and a second version, v4.01 (PAL/NTSC) was published to provide support for users with ECS Amigas.
Scene groups have never bothered to release this second version, so Amiga users with ECS machines will still require the original disk of version 4.01. The WHDLoad install is highly recommended.
 There exists another US version, v4.16, which runs on NTSC Amigas only.