The poor sales led to the development of "Mortal Kombat Nitro," an upgraded version of “Mortal Kombat” with all of the blood and gore put back in. James Fink, a product tester at Acclaim, took his ideas to Midway for “Mortal Kombat Nitro” and put together a working prototype of the game, which included new costumes, fatalities, features, and playable bosses.