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Dreamcast - Fighting Force 2 cheats

Unlimited health:
Press L + R + Y + A + Analog-stick Left  while you are at the Press start 
screen. If the code is accepted, you should see a screen flash.

All levels available:
Press Left, Up, X, Up, Right, Y while you are at the Press start screen.
If the code is accepted, you should see a screen flash. Begin a new game 
and select any levels.

All weapon available:
Go to the options screen and press A, B, Y, X, Y, B, A

Fireworks:
Complete the entire game, after go back to the "Start Game" screen.
Go "Load Game" after select "Options" tab to see fireworks.