City Crisis

Disaster mode
Achieve an "S" class rank on the final rescue mission to unlock disaster mode.

Chase car mode
Achieve an "S" class rank on the bus chase and at least an "A" class rank on all "Rescue" missions.

Bonus helicopters
Successfully complete all "Rescue" missions to unlock Bat and Pork as playable helicopters in all modes.

Time attack mode and final rescue mission
Successfully complete all "Chase" missions to unlock time attack mode and final rescue mission in mission mode.