Cheats for Advance GTA (GBA)
Hidden Go-Kart Mode
To access the Extra Go-Kart mode play through the
championship mode and beat the beginners, middle,
and high-speed classes. You should get a new car
after the last race you win that is a go-kart and
then go to the main menu and the first option that
was unlockable will say extra.
Formula 1 Mode
To access the Extra Formula 1 mode play through
the championship mode and beat all four of the
classes with a first place in each race. You will
get a new car after the last race. It is a Formula
1 race car. At the menu screen the Extra 2 option
will be available.