When Mortal Kombat came home in 1993, Nintendo scrubbed the blood and toned down the fatalities for the SNES, while Sega hid the full gore behind a cheat code — and the Genesis version outsold the sanitised SNES one, teaching the industry a lesson it never forgot.
The split screen of the console war has rarely been as literal as it was on Mortal Monday. The same game, on the two rival machines, embodied the two companies' entire brand strategies. Nintendo's SNES version — grey "sweat" instead of blood, Fatalities defanged, no way to undo any of it — was the family-friendly Nintendo made playable. Sega's Genesis version, bloodless until you entered ABACABB and then every bit as violent as the arcade, was the edgier, older-skewing Sega made playable. Players did not have to read a marketing deck to understand the difference; they could see it in the blood, or its absence.
The sales gap was the argument. When the Genesis version outsold the SNES one by roughly three to one, it demonstrated in the clearest possible terms that Nintendo's core teenage audience wanted the mature version and would buy the hardware that offered it. Nintendo absorbed the lesson quickly: it dropped the censorship for Mortal Kombat II and thereafter leaned on the new ESRB ratings to manage mature content rather than removing it outright. The blood code is remembered as a fun piece of trivia, but its real significance is that it marked the moment the console industry accepted that "mature" games were a market to be served, not a problem to be sanitised away.
The uncensored Genesis version outsold the sanitised SNES version roughly three to one; Nintendo reversed its policy for Mortal Kombat II, and the broader violence controversy helped produce the ESRB in 1994.