Grand Theft Auto
  
Game Boy

Level select: 


  Name your character LEVELS to unlock all cities.
 Hidden characters:


  Name the character KELLY to SUMNER to unlock the game's developers.
Infinite ammo: 


  Name your character FULL. 

Hints
Deal With the Angels:


  On the level Gangsta Bang when it says something like; waste some Angels because 
  they blew up some van...., Go to them, they will shoot at you. Just drive around 
  the block and they will just be standing there and they won't shoot at you. 
  You can just steal the motorbike or kill them at your own pleasure.



 
Thanks to Revolution reader Ashley Stroud!