Obtain a ranking of "Fever Time" in each level to unlock the Pander bonus level.
Play as Columbo
Beat the game with Shorty.
Play as ChiChi and Sally
Beat the game with Capoeira.
Play as Robo-Z Gold
Beat the game in Mix Mode and unlock the Pander bonus level.
Play as Pander
Beat the game with Robo-Z Gold and unlock the Pander bonus level.
Acid Line song
Enter the sound options screen and select music test. Then, hold Left or Right to quickly cycle through the song selections. Robo-Z Gold's song "Acid Line" will flash among the titles. Try stopping the cycling on that song to hear it.