Zombie Revenge
  
Dreamcast

Cheat Mode: 


  Rack up as many points as you can in the VMU mini-game to unlock the "Eternal 
  Life", "Area Select", "Free Continue", and "Free Time Limit" cheat options in 
  original mode. *Note: Exact number of points is unclear.
Blood Color Option: 


  Complete the game in arcade mode to open the "Blood Color" option.
Hidden Items in Biological Weapon (Industrial Sewage) Plant Level: 


  See the fan at the beginning of the Biological Weapon (Industrial Sewage) Plant 
  level? Shoot it (you can not use a button) to collect some hidden items. 
Different outfits: 


  Hold Start and press B, X, or Y when choosing your character to have a different 
  outfit.
Level Select:


  Select Fighting Mode from the main menu screen and hold start while you select 
  a character. Now, after you choose the Fighting Mode, you will be asked what 
  level you want to start on.

Free Play: 


  Complete the game in all three original modes to allow free play in arcade mode. 


Hints: 
More Health:


  In the begining of the game if you turn left you will see a door. Go through 
  the door and you will see a zombie with flies on it. Kill the zombie and shoot 
  the middle stack of boxes until a box of health falls. This will give you lots 
  of health. 
Extra Stuff:


  There are two doors in the sewage.One you can get double-pistols and in the 
  other there is a big box of health.



  Thanks to Revolution readers Michael Burkett, Tomahawk Sam, Cassie Dodson, Paul 
  and ChronoTrigger!