I had the ORIGINAL Game Genie (for NES) not SNES. So I can't attest to what the SNES version was like, but if it was anything like the NES version, low gravity jumps, infinite lives, big head/small bodies, and plenty of other good categories to modify or tweak. I recall having the original with the code booklet - back before there was the internet to pass codes around on a site like Gamefaqs.
Many glorious fun times were had.