Grand Theft Auto Advance

Grand Theft Auto Advance is an original top-down GTA adventure that fits in your pocket, right next to your handgun.

Cheat Mode
Press A + B + Start while you're in control of your character. The text "CHEAT MODE ON" will appear on the screen, and your character's coordinates in the map will appear on the right side of the screen.

Level Select
At the main menu, press Left, Right, Up, Down, L, R then hold Start and press A. An arrow will appear underneath the third menu option. Press Down to highlight the new option, which lets you start the game at any chapter and stage you wish.

Unused Weapon
There is an unused weapon that looks like a barrel, although only the HUD icon remains. It can, however, be accessed through Gameshark codes, even though it does nothing.