Fight as Human Smoke:
Successfully complete the game under the warrior difficulty setting (second tower). Start a new one player game and highlight the unknown square at the character selection screen to choose Human Smoke. Note: This can only be done one time.

Fight as Motaro:
Successfully complete the game under the master difficulty setting (third tower). Start a new one player game and highlight the unknown square at the character selection screen to choose Motaro. Note: This can only be done one time.

Fight as Shao Khan:
Successfully complete the game under the grand master difficulty setting (fourth tower). Start a new one player game and highlight the unknown square at the character selection screen to choose Shao Khan. . Note: This can only be done one time.