Mortal Kombat 1 Boss Hack Beta is an early, unfinished version of a ROM hack for the Sega Genesis version of Mortal Kombat. Details about specific changes and features are likely limited without access to the actual ROM. Being a "beta," it would likely contain bugs, unfinished features, and possibly unbalanced gameplay.  The original Mortal Kombat was developed by Acclaim for the Sega Genesis, based on Midway's arcade hit, and this hack represents a fan's attempt to modify the game. The creator is unknown without further information on the ROM.

Mortal Kombat 1 Boss Hack Beta

Mortal Kombat (World) (v1.1)