Grand Theft Auto Cheats (GameBoy)

Rename any character to "LEVELS" to unlock all cities. Alternately, rename any character
to "WENDY".

Rename the character "KELLY" to "SUMNER" to unlock the game's developers.

Rename any character to "FULL".

The following trick will advance the game to the next episode of the current level. Die or
get arrested until you have no lives remaining. When the screen displaying your stats
appears, press A to restart and use the same character. The next episode in the level
will be unlocked. Repeat this procedure to unlock all the levels. Note: Once you start
the next episode you must pause the game and press B button to quit in order for the
level to be stored in memory.