How do you unlock Reptile in mortal kombat1?
You cannot play as Reptile in Mortal Kombat 1. You can only
fight against him. Although there are glitches, where if Player 2
presses start to enter a fight while Player 1 is fighting Reptile,
the Ninjas will appear as Reptile but will not fight like Reptile.
There isn't even a Game Genie code to fight as him. The Dragon
symbol in the middle of the character selection screen does not
ever change into another character.
This answer is half right and half wrong. In the snes version of
the game after defeating shang tsung he will free all the souls he
has captured. when you see sub zero the first time he appears, hold
L and R (The trigger buttons) don't let go of the buttons until the
title screen appears and then start a new game. you will see
reptile's face in the upper middle of the screen. enjoy