It sounds like you're referring to a well-regarded ROM hack or patch for Ultimate Mortal Kombat 3 (UMK3). One of the most famous and highly praised in the fighting game community is the (sometimes called the "Juggalo Edition" or various balance/fix hacks), but the single most acclaimed "good" version of the UMK3 ROM for emulation is actually the arcade revision 1.2 (often labeled umk3.zip with the correct parent ROM set).
It sounds like you're referring to a well-regarded ROM hack or patch for Ultimate Mortal Kombat 3 (UMK3). One of the most famous and highly praised in the fighting game community is the (sometimes called the "Juggalo Edition" or various balance/fix hacks), but the single most acclaimed "good" version of the UMK3 ROM for emulation is actually the arcade revision 1.2 (often labeled umk3.zip with the correct parent ROM set).