Bat and Pork:
Complete all of the rescue-style missions.
The Bat and Pork helicopters will be unlocked in all modes.
Final rescue mission and time attack mode:
Complete all of the chase-style missions. Time attack
mode will now be unlocked. Select mission mode to access
the "Final Rescue" mission.
Chase car mode:
Achieve an "A" rank on each mission and an "S" rank on
the "Bus Chase".
Final rescue mode:
Achieve an "S" rank with the Sports Car.
Achieve an "S" rank in final rescue mode.