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.
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Threre is no L2 on the psp,there is only L1 or L, but there is on ps2 and ps3
If a game requires the R2 and L2 buttons, these are usually mapped to the PSP's analogue stick to the lower left of the screen.
There are no R2 and L2 buttons on the PSP. For any games that require them (usually converted PSX games), R2 and L2 are mapped to the PSP's analogue stick.
There isn't one. There are only the L1, R1, L2, R2, L3, and R3 buttons. The L1, L2, and R1, R2 buttons are on the top of the controller and the L3, R3 buttons are activated when you press down the analog sticks. This is usually indicated by a clicking noise.
R1, L2, Square, Circle, R1, R2, L2 All Weapons L1, R1, L1, L2, Square, Square, Circle Unlock all Missions L1, L1, Square, Circle, L1, R1, Circle Unlock all Vehicles Square, Square, L1, R1, L2, R2, R2 Invincibility (Doesn't work in Story mode) R1, R2, R1, R2, Square, Circle, Square Unlimited Ammo Circle, Circle, L1, L2, R1, R2, Square Immunity R1, L2, Square, Circle, R1, R2, L2 All Weapons L1, R1, L1, L2, Square, Square, Circle Unlock all Missions L1, L1, Square, Circle, L1, R1, Circle Unlock all Vehicles Square, Square, L1, R1, L2, R2, R2 Invincibility (Doesn't work in Story mode) R1, R2, R1, R2, Square, Circle, Square Unlimited Ammo Circle, Circle, L1, L2, R1, R2, Square Immunity R1, L2, Square, Circle, R1, R2, L2 All Weapons L1, R1, L1, L2, Square, Square, Circle Unlock all Missions L1, L1, Square, Circle, L1, R1, Circle Unlock all Vehicles Square, Square, L1, R1, L2, R2, R2 Invincibility (Doesn't work in Story mode) R1, R2, R1, R2, Square, Circle, Square Unlimited Ammo Circle, Circle, L1, L2, R1, R2, Square Immunity R1, L2, Square, Circle, R1, R2, L2 = All Weapons L1, R1, L1, L2, Square, Square, Circle = Unlock all Missions L1, L1, Square, Circle, L1, R1, Circle = Unlock all Vehicles Square, Square, L1, R1, L2, R2, R2 = Invincibility (Doesn't work in Story mode) R1, R2, R1, R2, Square, Circle, Square = Unlimited Ammo Circle, Circle, L1, L2, R1, R2, Square = Immunity