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Dreamcast - Dynamite Cop cheats

Infinite ammo:
Pause the gameplay and press A + L + B + Y.

Extra Level:
Find all pictures and finish all mission without using a singe contine

Unlock bonus missions 4, 5, and 6. 
Finish missions 1, 2, and 3.

Unlock  Monkey as playable character:
Finish missions 4, 5, and 6.

Unlock Bruno from Die Hard Arcade as playable character:
Find all illustrations in the game

Unlock Cindy from Die Hard Arcade:
Highlight Ivy at character seelction screen, after hold Start 

Unlock Tranquilizer Gun mini-game
Finish the game once.

Infinite credits in Tranquilizer Gun mini-game:
Finish missions 1, 2, and 3 without using a single continues