At the title screen, press Down + Y to record from the microphone. Press Down + Y at the title screen again to replay the captured sounds.

Successfully complete Story mode to unlock the "Sound Test" and "Another Story" options. In Another Story mode, you play as a robot trying to get the rival girl.

Successfully complete Scene 8 to unlock the Bull Survival mode option.

Successfully complete Scene 16 to unlock the Seashells Time Attack option.

Successfully complete Scene 23 to unlock the Snowball Chase Time Attack option.