The Mega Drive/Genesis EU Version has a difficulty option, but the US version doesn't.
The cleric was changed into a scientist in both PAL and NTSC version.
The original Amiga release was a PAL region game, thus the PAL version runs at the correct speed, both in terms of music and gameplay. Forcing the game into 60Hz mode makes the game play too fast. The NTSC version actually plays too fast compared to the Amiga original, although the music speed was ajusted. All versions have a bit of slowdown, likely due to the CPU co**olled partner. Scrolling is also is a bit choppy in both version, but less noticeable in the faster NTSC version.
Compared to the Amiga version, the co**ast has been increased and all stages have a color scheme neither found in the original Amiga version nor the Amiga AGA version and the ports to SNES, Amiga CD 32.