Extra points:
Complete 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.

Hint: Finding more items:
In Day 4, go to the second floor to find an open gate. Go to your right to reach a wall. There is a hidden door here that leads to a secret room containing two boxes. The first box contains a tool or other items (varies). The second box contains ammunition or other items (varies). This room will refill the boxes, as done in Wayne's room.

Hint: Finding the SP Vest:
Get to the point at the beginning of the game, after the clown in the basement dies. Check the room right below the room with the save phone. There is a suit of knight's armor and a dresser next to it. Search the wall next to the knight, and the wall with crumble. Crawl through the hole to find a "SP Vest" that has a very good critical rate.

Hint: Finding a tool in the sewer:
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.

Hint: Trade junk for weapons:
Collect the junk items that you come across during the game. Take the junk back to the police station to discard it. A choice of several powerful weapons will be available after discarding 300 pieces of junk

Hint: Navigating through the Chrysler building:
When looking for the item room, go right or left before going up or down. When looking for the stairs leading up to the next floor, go up whenever possible. After defeating a Boss on one of the "tenth" floors (10, 20, 30, 40, etc.), go to the elevator, go to the first floor and leave the building. Then, go to the police department and give any unneeded items to Wayne and save the game.

Hint: Tips for winning the game:
Complete the game as normal, then complete it in EX mode one or more times. Keep the same armor used when the game was completed the first time. Use all the extra bonus points to strengthen your weapon and armor, then go to the Chrysler building and use tools to strengthen new weapons. This is done by examining at the starting specs of the weapons. Example: An attack of 30+1, range of 20+2, and bullets of 40+0; refer to the first numbers. Use tools to move the parameters, and remember to do the same with your armor. Get all of the rare trading cards out of the Chrysler building and give them to Wayne to get the tool kit and super tool kit to upgrade your weapons as much as possible. Also remember to have a lot of room in the inventory for the final