Extra 500 Points:

During gameplay, press A, B, and Select simultaneously for 500 more points.

 

Hidden Message:

Before the title screen appears, press and hold A + B + Select. When screen turns black, release the buttons and enter this code sequence - A + Select, B + Select, Select + Start, A + Select, B + Select, Select + Start.

 

Sound Test:

At the title screen, press A on Controller 1, then select the music with Left or Right.