Courtesy of IGN, who has presented us with the second pack of new cheat codes for the PS2 version of GTA San Andreas.
CJ can now jump 10 times as high as before. That's right, CJ's getting higher than ever.
UP, UP, TRIANGLE, TRIANGLE, UP, UP, LEFT, RIGHT, SQUARE, R2, R2.
CJ turns into one hell of a tubby.
TRIANGLE, UP, UP, LEFT, RIGHT, SQUARE, CIRCLE, DOWN
CJ loses all the fat and the muscle to turn into one scrawny gangster.
TRIANGLE, UP, UP, LEFT, RIGHT, SQUARE, CIRCLE, RIGHT
Spawns a quad that drops down right in front of CJ.
LEFT, LEFT, DOWN, DOWN, UP, UP, SQUARE, CIRCLE, TRIANGLE, R1, R2
Spawns a Hydra in front of CJ.
TRIANGLE, TRIANGLE, SQUARE, CIRCLE, X, L1, L1, DOWN, UP
Spawns a hovercraft in front of CJ.
TRIANGLE, TRIANGLE, SQUARE, CIRCLE, X, L1, L2, DOWN, DOWN
Also, Psy of GTA-SanAndreas.com claims that even more codes exist, including all cars with nitrous, all cars with hydraulics, infinite health, infinite ammo, infinite oxygen, never wanted, anyone can be recruited to your gang, spawn Hunter, spawn Dozer, all streetlights "strobe" streetlights, all cars turn into bikes / countryside cars / sports cars / special vehicles. The existance of these codes has been confirmed through the game data, and they can be turned on/off, but the button combinations are as of yet unknown.