Unlimited ammunition (Japanese version): 
Pause the game and press L + A + B + Y.

Tranquilizer gun mini-game:
Successfully complete the game one time. 

Bonus missions:
Successfully complete missions 1, 2, and 3 without using all continues to unlock three
additional missions. Note: This also allows unlimited credits for the tranquilizer gun
mini-game. Mission 4 is based on mission 1 with a single life, double damage
weapons, and no continues. Mission 5 is based on mission 2 with a time limit in each
room and no continues. Mission 6 is based on mission 3, with very little health, few
health power-ups, no other power-ups, and no continues. 

Play as the Monkey:
Successfully complete missions 4, 5, and 6 to unlock the Monkey. The Monkey fights
similarly to Bruno. 

Play as original Bruno:
Collect all illustrations in the game to unlock the original Bruno from Die Hard Arcade. 

Extras:
Note: This trick requires the Dreamcast Web Browser. Load the web browser and
enter the Sega's Dreamcast Network site. Enter the Games/Downloads/Game Extras
area. Download the "Dynamite Cop Detonator Pack" on a VMU that contains a saved
file from the game. Start the game CD and enter the option menu. Select the
"Detonator Pack" and choose to combine the Detonator Pack with your existing
saved game file. The following extras will now be unlocked. A bonus stun gun weapon
will appear randomly during the game. Extra graphics will appear in Caribbean
Pirates mode. Highlight Ivy at the character selection screen, then hold Start. Cindy
from Die Hard Arcade will be unlocked. 

Hint: Arresting enemies:
You cannot arrest someone important such as the big "crab" guys or a baker. The only
people that can be arrested are most of the regular people. In order to arrest a
person, you must have a pistol (and not a machine gun). The person must be
weaponless. Get behind them and press X. That should make the cop say "Freeze".
Immediately press X again to avoid getting kicked. If done correctly the person should
be crawling on their knees with their hands behind their backs.