EX Game mode:
Finish the game once to enable an option that allows the game to be played in a new mode. This mode also includes access to the Chrysler Building shortly after Day 2.

If you let Wayne store your Medicines, Cards, Or Mod permits before you complete the game, you will start with those items in Wayne's storage in the EX Game mode.

Extra points:
Finish one day without saving the game to receive extra BP points when the following day begins.

Extra ammunition:
Return to the police station and open the box inside the weapon storage room to collect thirty bullets. This may be done a total of ten times during the game.

Track the helicopter:
Press Select at the city map screen to track the helicopter as it flies around the city.

Tool:
A super tool can be found in the sewer, in one of the dead ends. When you climb down from the ladder, go to the left and check all the dead ends. After reaching one, stop and check along the left side. about half-way up. The tool will glitter.