The Mortal Kombat 2 source code has leaked, and a video shows some of the content that's been hidden all these years, including cut moves, fatalities, and more. As one of the most influential fighting games of all time, the original Mortal Kombat that released in 1992 not only inspired many other titles that came after it, but was also partly responsible, along with contemporaries like Doom and Night Trap, for the formation of the Entertainment Software Rating Board, or ESRB, due to outcry over its depictions of violence.