DOS versionThe PC version contains 16 colours only because it was written using "Realms" shell which had CGA and VGA 16 colour drivers.
Master System versionThe Master System version was supposed to be released in Europe in 1994, but the development was aborted. Only later was the game picked up in a somewhat unfinished state for release in Brazil, where the Master System was still a successful console. There was also a Genesis version in development.
Xmas editionThere is a Xmas special edition with winter levels
Contributed by B.L. Stryker (20696) on Nov 13, 2003. [revised by : Patrick Bregger (98683)]. -- edit trivia