L1 is the left 'shoulder' button.
L1, R1, Circle, L1, R1, Square
the cheat is L1 L1 X X R1 O X
Cirlce,x,up,circle,x,down,l1,l1
Square R1 Circle L1 Triangle
If you are using a Ps2,it means L1 and R1. If PSP in cheats L1 and R1 are the shoulder buttons.
There is a cheat that gives you $250,000 which is: L1, R1, Triangle, L1, R1, Circle, L1, R1 THIS SHOULD WORK FOR PSP AND PS2 Or if you don't like cheats then you can do the main story missions.
The cheat is L1, L1 , left, L1 ,L1 ,right ,square, triangle ( only works for PSP .)
the cheat is: L1, L1, LEFT, L1, L1, RIGHT, TRIANGLE, CIRCLE
there is a red small plane in the viceport but there are no cheats for that
The L1 button is the left 'shoulder' button. While the PSP doesn't technically have a L2, games that need it usually have it mapped to the PSP's analogue stick.
The cheat code is L1, L1, LEFT, L1, L1, RIGHT, TRIANGLE, CIRCLE
For PSP the tank cheat is L1,L1,LEFT,L1,L1,RIGHT,TRIAGLE,CIRCLE. The tank is completely invincible and destroys any car (except for other tanks) in one hit.