Missions A-2 to A-4:
Successfully complete mission A-1.
Dragon-SPL Car:
Successfully complete mission A-1.
Tiger-SPL:
Successfully complete mission A-8 (Tiger Tagachi's car).
AUV:
Successfully complete mission A-9.
Missions B-2 to B-4:
Successfully complete mission B-1.
Super Car:
Successfully complete mission B-1.
Tank-90:
Successfully complete mission B-8.
Yakuza Car:
Successfully complete mission B-9.
Music test:
Complete all twenty missions successfully to unlock the Music Test selection at the Options screen.