You will fight Khameleon first, then Motaro, then 8 endurance matches, and finally Shao Kahn. If you did the code right, the Champion tower will change lineup.
Like Shao Kahn, after the fight, you will turn back to the character you picked. If you did it right, your character will change to Motaro. Select any character, then fight at Kahn's Tower, the Wasteland, or the Desert. After the fight, you will turn back to the character you picked. If you did it right, your character will change to Shao Kahn. Select any character, then fight at the Pit 3 or the Rooftop.