At the title screen or while playing the game, hold L and press Up, Down, Left, Right, Square.

At the title screen or while playing the game, hold L and press Up, Down, Left, Right, Triangle.

Successfully complete the game on the Hard difficulty setting to unlock the Expert difficulty setting.

It is recommended that you start out as a Seal, and use laser weapons so that you will never run out of ammunition.

At the main menu, select "Options", choose "Player Profile", then select the "Enter Cheat" option. Enter "All Access" as a code to unlock all bikes except for the Fury.

At the main menu, select "Options", choose "Player Profile", then select the "Enter Cheat" option. Enter "Duds" as a code to unlock all rider gear.

At the main menu, select "Options", choose "Player Profile", then select the "Enter Cheat" option. Enter "Dubs" as a code to unlock all rims.

At the main menu, select "Options", choose "Player Profile", then select the "Enter Cheat" option. Enter "Smog Test" as a code to unlock all exhaust pipes. -From: therealzaeea@yahoo.com

At the main menu, select "Options", choose "Player Profile", then select the "Enter Cheat" option. Enter "Billboards" as a code to unlock all music videos.

At the main menu, select "Options", choose "Player Profile", then select the "Enter Cheat" option. Enter "$moneybags$" as a code.

Successfully complete all courses in training mode with a "Gold" rank to get three Talon ATVs; complete them with a "Silver" rank to get two Talon ATVs; complete them with a "Bronze" rank to get one Talon ATV.

Win a gold cup for a level on the normal difficulty setting to unlock a harder version of that level.

Successfully complete the game with no cheat codes enabled and any desired costume with an "AAA" score to unlock View mode.

Successfully complete the indicated task to unlock the corresponding costume:

Apron Dress: Successfully complete the game on the Easy difficulty.
Business Suit: Successfully complete the game. Note: The costume is in the left-hand locker room in the CTI Building.
China Dress: Successfully complete the game on the Normal difficulty.
Knight Armor: Successfully complete the game on the Deadly difficulty.
Lightning Custom: Successfully complete the game and have at least seven stamps on the Square-Enix Member site.
OD Suit: Successfully complete the game and have at least one stamp on the Square-Enix Member site.
Santa Soldier: Successfully complete the game. Note: The costume is found by going down the stairs to the lockers in Maeda's Base, and searching the one on the left.
Swim Wear: Successfully complete the game on the Hard difficulty.
Titanium Bunny: Successfully complete the game on the Genocide difficulty.

Successfully complete the game twice to view an extra scene after the credits.

Successfully complete the game fifty times to unlock the shower scene in the "Video Log" menu. View the scene in the Video Log ten times to be able to change the camera angle to her back.

Start a New Game+ mode game. To unlock both cheats at no cost, unlock them using your BP, then reload the same New Game+ mode saved game without saving first. The game will resume with your original amount of BP, and the cheats will remain unlocked.

The in-game clock will count the time that elapses while the PSP is in sleep mode. Thus, the completion time of the game may be greatly exaggerated if sleep mode is used for a prolonged amount of time.

Successfully complete the indicated task while OP-INTENSIFY is equipped to unlock the corresponding feature for the OP-INTENSIFY part:

Blade wave ability: Successfully complete "Destroy Massive Weapon". Execute this move by pressing [Left Arm Weapon], then using boost in mid-swing.
Enhanced booster performance: Defeat Arena opponent A-2, Ace.
Enhanced cooling performance: Successfully complete "Destroy Massive MT."
Enhanced core missile interception: Successfully complete "Defend Water Processors" after defeating the AC.
Enhanced turning performance: Successfully complete "Bomb Disarmament" after defeating the AC.
Fire back weapons without kneeling: Destroy both parts of the MT in "Destroy Massive MT".
Improved targeting accuracy: Successfully complete "Defend Ruglen Laboratory" after defeating the AC.
Increased blade range: Defeat Arena opponent E-32, Exile.
Radar function without a radar equipped: Defeat Arena opponent D-1, Thunder House.
Various sensor functions: Successfully complete "Eliminate Intruders" after defeating the AC. This effects the bio sensor, missile tracking, etc.

Successfully complete the indicated task to unlock the corresponding part. Note: In some missions, you must have your company loyalty rating at a particular level for that part to appear. If they do not appear at first, try again when the mission can be replayed.

CAL-44-EAS (arms): Appears at the shop during Story mode.
CAW-DC-03 (weapon arms): Defeat rank A-1 in Arena mode.
CAW-DS604 (back unit): Appears at the shop during Story mode.
CBT-FLEET (booster): In "Destroy Massive MT", behind a hill in the northwest corner.
CEBT-HEX (extension): Successfully complete "Safeguard Alloy Sample" without losing the transport.
CEEC-01-XSP2 (extension): Successfully complete "Eradicate Life Forms" without breaking the gas canisters.
CHD-04-YIV (head): In "Defend Naire Bridge", below the start on a platform under the bridge. Note: Go to the open end, and fly back underneath.
CHD-GLITCH (head): Defeat rank E-33 in Arena mode.
CLL-EM-070 (legs): Defeat rank C-10 in Arena mode.
CLR-00-MAK (legs): Defeat rank A-3 in Arena mode.
CWC-SLU-64 (back unit): Defeat rank B-7 in Arena mode.
CWGG-GR-12 (right arm weapon): Defeat rank C-15 in Arena mode.
CWGG-HG-10 (right arm weapon): In "Defend Helicopter Crew", on top of a pipeline to the northeast.
CWM-S60-10 (back unit): Win in Arena mode.
CWX-LIX-10 (back unit): Appears at the shop during Story mode.
CWX-LIX-10 (legs): Appears at the shop during Story mode.
KES-ES/MIRROR (left arm shield): Unlock the bonus mission in "Defend Water Processors", then complete it.
KWB-MARS (right arm weapon): In "Destroy Massive Weapon", on a beam under the starting platform
KWG-HZL30 (left arm weapon): In "Destroy Naire Bridge," destroy both monorails that pass by, then complete the mission.
KWM-AD-50 (back unit): In "MT Training Exercise", do not get hit by a single missile.
KWX-OC-22 (back unit): In "Destroy Germ Canisters", destroy all enemies and complete the mission.
MAL-303S (arms): Defeat rank D-5 in Arena mode.
MCM-MX/002 (core): Appears at the shop during Story mode.
MEBT-OX/MB (extension): In "Rescue the Survey Team", hidden in a nook in the wall to the left of the closed door.
MEST-MX/CROW (extension): In "Disable Pulse Generators", go through the breakable grate above one of the generators on the lower level.
MGP-VE905 (generator): Defeat rank D-15 in Arena mode.
MHD-RE/H10 (head): In "Destroy Escaping MT", outside the door where the real mission target appears.
MLB-MOONLIGHT (left arm weapon): Successfully complete "Destroy Massive MT" without a consort.
MLB-T/100 (left arm weapon): In "Assault Crest Facility", on top of the last generator.
MLH-MX/VOLAR (legs): Get a good score in AC Test 1; hit 35 to 40 targets without missing.
MLR-MM/PETAL (legs): Appears at the shop during Story mode.
MLR-ZMX (legs): Defeat rank B-2 in Arena mode.
MRL-SS/SPHERE (back unit): In "Protect Crest Convoy", behind a radar dish to the left of the ravine near the start.
MWC-XP02/75 (back unit): In "Defend Energy Reactor", on the floor in one of the right-side hiding locatoins on the way to the reactor.
MWG-HG/111 (right arm weapon): In "Bomb Disarmament", at the bottom of the molten pit.
MWG-KARASAWA (right arm weapon): In "Destroy Gun Emplacements", destroy the cannons as quickly as possible to unlock the bonus mission, then complete it.
MWG-SBZ/24 (right arm weapon): In "Recover Ship Cargo", at the bottom level of the ship.
MWG-XCB/75 (right arm weapon): In "Defend Ruglen Laboratory", destroy the enemy AC, then complete the mission.
MWGG-XCG/20 (right arm weapon): Appears at the shop during Story mode.
MWI-DD/20 (inside part): In "Defend Water Processors," on the ground behind the pipes to the right of the start.
MWR-M/45 (back unit): In "Safeguard Water Supply", behind an outcropping at the top of the dam.
MWX-MX/STRING (back unit): Successfully complete the game.
OP-E-LAI (optional part): Defeat rank C-5 in Arena mode.
OP-E-LAP (optional part): Appears at the shop during Story mode.
OP-INTENSIFY (optional part): Successfully complete the game.
RIX-CR5000 (radiator): In "Eliminate Infiltrators", after opening the door to floor 6F, along the far wall.
RMR-ICICLE (radiator): In "Defend Personnel Convoy", do not lose any ally vehicles.
VREX-WS-1 (FCS): Defeat rank D-10 in Arena mode.