R1 is the right 'shoulder' button. There is no formal R2 on a PSP but if a game needs it, it defaults to the analog stick, pushed to the right.
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R1, R1, R2, R2, Right Trigger, Left Trigger, R1, R1, R2, R2.
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
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.
yes there is
R2, U4, D2, R3, U2, L1, U2, R1, U1, R3, D2, L3, D1, L1, U1, D1, R1, D2, L3, D2, L2, U2, R4, D1, R1, U5, D1, R2, D2, R1, D2, L1, U1, L5, D2, L2, U2, R4, D1, R1, U4, R2, D2, R1, D1, L6, D2, L2, U2, R4, D1, R1, U3, D2, L3, U2, L1, U2, R1, D4, L2, D2, R2, U1, D1, L2, U2, R4, D1, R1, U2, D1, L3, U3, RI R2, U4, D2, R3, U2, L1, U2, R1, U1, R3, D2, L3, D1, L1, U1, D1, R1, D2, L3, D2, L2, U2, R4, D1, R1, U5, D1, R2, D2, R1, D2, L1, U1, L5, D2, L2, U2, R4, D1, R1, U4, R2, D2, R1, D1, L6, D2, L2, U2, R4, D1, R1, U3, D2, L3, U2, L1, U2, R1, D4, L2, D2, R2, U1, D1, L2, U2, R4, D1, R1, U2, D1, L3, U3, RI