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Dreamcast - The House of the Dead cheats

Change blood color:
Finish original mode once

Unlock Goldman costume in the trunk of the car:
Finish the game in original mode once.

Infinite "one-hit kills" ammo:
Finish training mode and reach 5 red star rank on each stage. 

Unlock "Emperor" and "Fight All" option:
Beat all Bosses in Boss mode

Play as Gary instead of James
In single player mode use a controller in port B.

Free play in original mode:
Finish training mode and reach 5 red star rank on each stage.
After, finish boss mode and reach 5 red star rank. 
At last, obtain 2 stars in fight all mode.
The "Continue" option will change to "Free Play". 

Unlock Rogan costume and infinite credits:
Start the game in original mode and choose the Double Score items 
and the 2.0 bullets. Save all civilians except for the 2nd person 
on stage four. Finish the game and go to the bonus room to pick up
the new costume and infinite credits.