Enter this cheat when playing the Armies of The Night mini-game.
During gameplay
Successfully complete the game, then during the ending credits you can play as the Riffs and fight against the Rogues on the beach.
After completing the last story mission, "Come Out to Play", you will view the credits. Watch them and you will be able to play a brawling mini-game in the background after a while as the credits roll. It is the scene on the beach after you defeat the last Boss and the Riffs show up. You will play as the leader of the Riffs and beat on the remaining members of the street gang that framed the Warriors. If you look closely, you have the same fighting moves as the deceased Cleon.