Just as Street Fighter II Champion Edition allowed players to fight as the four unplayable characters of Street Fighter II, Mortal Kombat Champion Edition allows players to fight as the three unplayable characters of Mortal Kombat: Reptile, Goro and Shang Tsung!!

The three hidden characters are accessed by inputting special codes on the select screen.

Codes: Play as Reptile: On the character select screen, hold select while selecting Sub-Zero. Play as Goro: On the character select screen, hold select while selecting Johnny Cage. Play as Shang Tsung: On the character select screen, hold select while selecting Liu Kang.