- The SNES console version of the game has a modified story in which the Princess has two hours to decide her fate (instead of 60 mins) and our hero has to conquer extra levels.
- The original Apple II version, released in 1989 used only four colors. The MS-DOS version for the IBM PC as well as the Commodore Amiga and Atari ST versions released in 1990 used more colors allowing much more detail.
- Later versions of the game (ie. version 1.3 and others) for MS-DOS featured different color palettes for different sections of the game and the ability to adjust the game settings for the computer used.
- Certain versions released for home consoles (Super Nintendo etc.) remove some of the bloodshed.
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