Level select/new difficulty levels
 
 While playing a game, press Triangle, Square(2), Triangle, Circle(2),
 Square(2), Triangle, Circle, Square(2). Now quit the current game and
 start a new game after you have entered the code. The "Ace" and
 "Insane" difficulty levels will now be available. All levels,
 including the secret levels, may now be selected.
 
 All weapons
 
 While playing a game, press Triangle, Square, Circle, X, Triangle,
 Square, X, Triangle, Square, X, Circle, Square. Enter this code in a
 safe place. 
 
 Ten lives, all weapons, and level select
 
 While playing a game, press Triangle, X, Square(2), Triangle,
 Circle(2), Square, Triangle, Square, Circle, X. Enter this code in a
 safe place. 
 
 All levels keys
 
 While playing a game, press Square, X, Circle, Triangle, X, Triangle,
 Triangle, X, Triangle, X, Triangle, X.
 
 Invincibility
 
 While playing a game, press Square, Triangle, Circle, Square(2),
 Triangle, Circle(2), Square, Triangle, Square, X.
 
 Increase visibility
 
 While playing a game, press Square, Triangle, Circle, Square(2), X,
 Circle, Triangle, Square, Circle, X, Triangle. This will make the
 screen colors turn brighter.
 
 Extra life
 
 While playing a game, press Square, Triangle, Circle, Square, Circle,
 X, Square, Triangle, Circle, Triangle(2), X.
 
 Recharge shields
 
 While playing a game, press Triangle(2), X, Square, Triangle, Circle,
 Triangle, X, Square, X, Triangle, X. If you entered the code
 correctly, a woman's voice will say "Cheater" and the phrase "Shield
 Recharged" will appear. 
 
 Turbo speed
 
 While playing a game, press Square, Triangle, Circle, Square, Circle,
 X, Square, X, Circle, Triangle, Square, X.
 
 Cloaking device
 
 While playing a game, press Triangle, Square, X, Circle, Square, X,
 Circle, Triangle, X, Square, X, Triangle.
 
 Cycle colors
 
 While playing a game, press Square, Triangle, Circle, Square(2),
 Triangle, Circle(2), Square, Triangle, Square, X, Triangle, X,
 Square, Triangle. Repeat this code for different colors.
 
 Weird colors
 
 While playing a game, press Square, Triangle, Circle(2), Square,
 Triangle, Square, X, Triangle, X, Square.
 
 Weird robots
 
 While playing a game, press Square, X, Square, X, Circle, Square,
 Circle, Square, Triangle, Circle(2), Square.
 
 Level passwords
 
                       
  Level 
  Password               
                       
  2     
  DBG4B-JB7S7-DS4#Y-MSBYB
                       
  3     
  QQM#B-7B7S7-DHLTQ-8VBXV
                       
  4     
  SGVFB-JM7TB-GNMXG-JWB5V
                       
  5     
  N*5KB-STLVQ-HC344-62B3B
                       
  6     
  Y8FPB-SL3TB-JAM66-S9D2V
                       
  7     
  XORTB-SQGTB-HBMC8-VBF#B
                       
  8     
  RH2FB-NV70*-GBL5Q-*BBBB
                       
  9     
  8SHKB-9WLT*-JPLD8-NCCKB
                       
  Game Shark Codez:
 
                 
  Invulnerability              
  800D109C 040F
                 
  Infinite Shield              
  800D10A6 0064
                 
  Infinite Energy              
  800D10A2 0064
                 
  Infinite Concussion Missiles 
  800D10BA 0009
                 
  Infinite Homing Missiles     
  800D10BC 0009
                 
  Infinite Proximity Bombs     
  800D10BE 0009
                 
  Infinite Smart Missiles      
  800D10C0 0014
                 
  Infinite Mega Missiles       
  800D10C2 0014
                 
  Infinte Vulcan Ammo          
  800D10B2 9684
                 
 -Some Game Shark Codez: From: avidgamr@blueriver.net