Cheat Mode
Press Down, Up, Left(2), A, Right, Down at the Main menu.

Fight as Goro
Complete the game. When the text “The End” appears, hold Up/Left + Select + A until the Title Screen appears. Press Start to begin a new game.

Fight Against Reptile
Play the game until reaching the Pit. Achieve a double Flawless Victory without blocks and perform a fatality to end the match.