Defeat Wang and save the princess. Repeatedly tap Up, Down and press 1 + 2 before the screen turns red.
Press 1 to begin game play. Hold 1 when the red screen with the number of players is displayed. Release 1 when a flashing blank screen appears. Hold Reset and Riki will appear in the top left corner. Wait until Riki dies and his energy bar fills, then release Reset. Game play will begin will unlimited lives. Note: Enabling this code will offset the graphics in the first level of the game. Additionally, the timing of holding Reset during the flashing blank screen is very precise.