Level select
 
 At the level select screen with the globe, highlight Russia and press
 Right. Hold X + Down/Left before the Japanese mission details appear.
 The globe will begin to bounce through the levels. To choose a level,
 release the buttons when the desired level is selected.
 
 True ending
 
 On the final level (Japan), when the shield generator is blown up,
 walk into the center of the explosion for a hidden level and the true
 ending of the game. 
 
  Game Shark Codez:
 
                   
  Infinite Shields          
  800C4CD0 0064
  800C4CD4 0064
  800C4CD8 0032
  800C4CDC 0032
  800C4CE0 0032
  800C4CE4 0032
  800C4CE8 0032
  800C4CEC 0064
                   
  Infinite 50mm             
  8008D1A4 012C
                   
  Infinite Labor            
  8008D1A8 00FA
                   
  Infinite Plasma           
  8008D1AC 003C
                   
  Infinite Cannon           
  8008D1B0 0046
                   
  Infinite Missiles         
  8008D1D4 000A
  8008D1DC 000A
                   
  Inifnite Hyena Missiles   
  8008D1D8 000A
                   
  Infinite Cerebus Missiles 
  8008D1E0 000A
  8008D1E4 000A
  8008D1E8 000A
                   
  Infinite Scythe           
  8008D1B4 0009
                   
  Infinite Vortex Bombs     
  8008D1B8 0009
                   
  Infinite ULF Pulse        
  8008D1BC 0009
                   
  Infinite EM Pulse         
  8008D1C0 0009
                   
  Infinite Kraken           
  8008D1C4 0009
                   
  Infinite Medusa           
  8008D1C8 0009
                   
  Max Energy Cores          
  80089670 00D0
                   
  Cannon Coolant            
  800D1C6C 0000
                   
  Freeze Timer              
  800C4CF2 0009
                   
  Never Overheat            
  800D1CB8 0000