Invincibility
 
 Pause the game and press Down, L2, Square, R1, Right, L1, Left,
 Circle. 
 
 Level select
 
 Pause the game and press Right, Left, R2, R1, Triangle, L1, Circle, X.
 
 Weapons, ammunition, and keys
 
 Pause the game and press X, Triangle, L1, Up, Down, R2, Left(2). Now
 all weapons, ammunition for them, and keys for the current level will
 be available. 
 
 Map all lines
 
 Pause the game and press Triangle(2), L2, R2, L2, R2, R1, Square. Now
 all walls and boundaries will appear on the map for the current stage.
 
 Map all objects
 
 Pause the game and press Triangle(2), L2, R2, L2, R2, R1, Circle. Now
 all objects including enemies, items, weapons, and secret switches
 will appear on the map.
 
 Transparent walls
 
 Pause the game and press L1, R2, L2, R1, Right, Triangle, X, Right.
 Now your character may see through one layer of wall or sprites.
 
 Mission passwords
 
 Master level:
 
                             
  Mission 
  Password  
                             
  2       
  610QNNFT35
                             
  3       
  F!R251P1FD
                             
  4       
  RBB4M6HRST
                             
  5       
  QWC5CS83QS
                             
  6       
  NJJ64RFRPM
                             
  7       
  N1J74MYSPR
                             
  8       
  811TMQ8W64
                             
  9       
  7KKNL7D443
                             
  10      
  28RFDDS5YX
                             
  11      
  C66YZLSGGG
                             
  12      
  GR85XJVNBD
                             
  13      
  C33V2DHGHK
                             
 Level 2:
 
                             
  Mission 
  Password  
                             
  2       
  7GGLPXL746
                             
  3       
  YZGLPX2!56
                             
  4       
  XHHSNYB965
                             
  5       
  75NK!VGZZO
                             
  6       
  C2253RNRML
                             
  7       
  NT!3JRNDCB
                             
  8       
  8LLT8KRV02
                             
 Level 3:
 
                             
  Mission 
  Password  
                             
  10      
  !6PQGGJVOZ
                             
  11      
  WHHTNNPS65
                             
  12      
  O1JQYV3N34
                             
  13      
  5MMD72GFZ1
                             
  14      
  HK25JRDQNL
                             
  15      
  S772MKWKCF
                             
  16      
  78RB35L1VX
                             
  17      
  J226DG5PNL
                             
  Game Shark Codez:
 
                  
  Joker Command              
  800782D4 ????
                  
  Infinite Health            
  800AB330 0064
  800AB33C 0001
  80127C58 0064
                  
  Infinite Armor             
  800AB334 0064
                  
  Infinite Bullets           
  800AB3A4 0063
                  
  Infinite Shotgun Shells    
  800AB3A8 0063
                  
  Infinite Plasma            
  800AB3AC 0063
                  
  Infinite Rockets           
  800AB3B0 0063
                  
  Have Shotgun               
  800AB388 0001
                  
  Have Double Barrel-Shotgun 
  800AB38C 0001
                  
  Have Chain Gun             
  800AB390 0001
                  
  Have Rocket Launcher       
  800AB394 0001
                  
  Have Plasma Rifle          
  800AB398 0001
                  
  Have B.F.G. 9000           
  800AB39C 0001
                  
  Have Chainsaw              
  800AB3A0 0001
                  
  Always Have Red Key        
  800AB354 0001
                  
  Always Have Blue Key       
  800AB358 0001
                  
  Always Have Yellow Key     
  800AB35C 0001
                  
  Mega Rapid Fire            
  800AB3F8 0001
                  
  Always Have Map            
  800AB34C 0001