Now I absolutely LOVE Earthworm Jim no matter which version you speak of, but as far as I know, nobody has actually taken the time to explain the *many* differences between the Genesis and Super NES version.  Let me do this right now.  Just a quick note- even though I may throw out some criticisms from time to time, this by no means diminishes the quality of this version.  Earthworm Jim is awesome no matter WHICH edition you pick up!