Dynamite Cop / Dynamite Deka 2

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 Cindy Holiday:
Integrate the detonator pack. Highlight Jean at the character selection screen and hold Start.

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 holdStart. Cindy from Die Hard Arcade will be unlocked. 

출처 : http://www.gamewinners.com/DC/DynamiteDeka2.htm