Cheat Codes
 
 Start a game, kill the first two aliens and enter the room from which
 they came from. Then, enter one of the following codes:
 
 Level select
 
 Hold L1 + L2 + R1 + R2 + Triangle and then quit your current game. If
 you entered the code correctly, you will see a green light. Then, go
 to the opening screen where you can now choose a starting level from
 1 to 16. 
 
 Invincibility
 
 Hold L1 + L2 + R1 + R2 + X. If you entered the code correctly, you
 will see a blue light.
 
 All weapons with infinite ammunition
 
 Hold L1 + L2 + R1 + R2 + Circle. If you entered the code correctly,
 you will see a red light.
 
  Game Shark Codez:
 
 
 
  Infinite Energy                                              
  80083238 FF00
 
 
  Lasers Never Overheat                                        
  80083740 0000
 
 
  Slow Motion                                                  
  80080B98 23EF
 
 
  Infinite Machine Gun                                         
  8008316C 0FFF
 
 
  Infinite Grenade Launcher                                    
  800832AC 00FF
 
 
  Infinite Rocket Launcher                                     
  80083344 00FF
 
 
  Infinite Rail Gun                                            
  80083446 00FF
 
 
  Have Machine Gun                                             
  8007AB2C 010A
 
 
  Have Grenade Launcher [Note]                                 
  8007AB3C 010D
 
 
  Have Dual Grenade Launchers [Note]                           
  8007AB3C 010E
 
 
  Have Triple Grenade Launchers [Note]                         
  8007AB3C 010F
 
 
  Have Rocket Launcher                                         
  8007AB4C 0110
 
 
  Have Rail Gun                                                
  8007AB6C 010C
 
 
  Secondary Weapon Modifier                                    
  80083760 00??
 
 
  Primary Weapon Modifier                                      
  8007AB0C 00??
 
 
  Infinite Primary, Secondary Weapons, and Level Select        
  8007AB5C 0616
 
 
  Single Shot Laser Position Modifier                          
  80083760 000?
 
 
  Quantity Digits to Accompany Secondary Weapon Modifier Code  
 
 
  00 - N/A                                                     
 
  01 - Double Blue Laser                                       
 
  02 - Double Green Laser                                      
 
  03 - Triple Blue Laser                                       
 
  04 - Triple Green Laser                                      
 
  05 - Quad Blue Laser                                         
 
  06 - Quad Green Laser                                        
 
  07 - Plasma Cannon                                           
 
  0A - Machine Gun                                             
 
  0C - Rail Gun                                                
 
  0D - Grenade Launcher                                        
 
  0E - Dual Grenade Launchers                                  
 
  0F - Triple Grenade Launchers                                
 
  10 - Rocket Launcher                                         
 
 
  Quantity Digits to Accompany Primary Weapon Modifier Code    
 
 
  00 - N/A                                                     
 
  01 - Double Blue Laser                                       
 
  02 - Double Green Laser                                      
 
  03 - Triple Blue Laser                                       
 
  04 - Triple Green Laser                                      
 
  05 - Quad Blue Laser                                         
 
  06 - Quad Green Laser                                        
 
 
  Quantity Digits to Accompany Single Shot Laser Position      
 
  Modifier Code                                                
 
 
  0 - Bottom Right                                             
 
  1 - Top Right                                                
 
  2 - Top Left                                                 
 
  3 - Bottom Left                                              
 
 Note: Do not use these codes together.